Affirmed by published opinion. Judge WILKINSON wrote the opinion, in which Judge MICHAEL joined. Judge LUTTIG wrote an opinion concurring in the judgment.
OPINION
Joseph Revels brings this challenge under United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005), to the district court’s application of a four-level sentencing enhancement and its imposition of a 120-month sentence under the then-mandatory Sentencing Guidelines. We hold that the district court committed Sixth Amendment error because the facts underlying the four-level enhancement were neither admitted by the defendant nor proved to a jury beyond a reasonable doubt. But we also hold that because the district court issued an alternative identical sentence treating the Guidelines as advisory only, any error was rendered harmless. We therefore affirm the judgment of the district court.
I.
On December 20, 2002, defendant Joseph Revels and an accomplice robbed a convenience store in Rowland, North Carolina. Revels concealed his face with a slotted mask, brandished a.25 caliber handgun, and fled with $800 in cash. He later turned himself in to authorities, provided a recorded confession, and identified his accomplice.
Revels was charged with possession of a firearm by a convicted felon, see 18 U.S.G. §§ 922(g)(1), 924(a)(2) (2000), and pleaded guilty. At his plea hearing on September 20, 2004, the district court informed him that his sentence would be calculated after completion of a presentence report (PSR). It further instructed Revels to review the PSR, and reminded him about the proper procedures for raising objections to the facts contained therein.
The PSR recommended a base offense level of 24, see U.S. Sentencing Guidelines Manual § 2K2.1(a)(2) (2003), and a four-level enhancement for use or possession of a firearm in connection with another felony offense, namely, the convenience store robbery, see id. § 2K2.1(b)(5). The PSR also recommended a three-level reduction for acceptance of responsibility. See id. § 3El.l(b). The final offense level was therefore 25. Combined with a proposed criminal history category of V, the specified Sentencing Guidelines range was 100 to 120 months imprisonment, as capped by the statutory maximum in 18 U.S.C. § 924(a)(2). As relevant here, defendant filed a written objection to the four-level enhancement, contending that the facts forming the basis for the enhancement “were neither admitted to during a plea or presented to a jury,” in contravention of Blakely v. Washington, 542 U.S. 296, 124 S.Ct. 2531, 159 L.Ed.2d 403 (2004).
At his sentencing hearing on January 4, 2005, Revels testified that he had read the PSR and discussed it with his lawyer. He *450renewed Ms Blakely objection, which the district court overruled. The district court thereafter asked defendant if he had “any objections to anything contained or omitted from the report,” and defendant responded “No, sir.” Adopting the findings in the PSR as credible and reliable, the district court sentenced defendant to 120 months in prison and three years of supervised release. Pursuant to our decision in United States v. Hammond, 381 F.3d 316, 353-54 (4th Cir.2004) (en banc), the district court also prescribed an alternative identical sentence under 18 U.S.C.A. § 3553(a) (West 2005), treating the Guidelines as advisory only. In Hammond, 381 F.3d at 353-54, we advised lower courts to announce an alternative sentence under § 3553(a) in the event that — as actually came to pass — the Supreme Court applied its holding in Blakely to the federal Sentencing Guidelines, see United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 746, 160 L.Ed.2d 621 (2005).
II.
Revels contends on appeal that the district court’s four-level enhancement for his use or possession of a firearm in connection with the robbery is unconstitutional under Booker. According to defendant, his maximum Guidelines sentence absent the enhancement would be 115 months, and the district court improperly augmented his sentence by five months on the basis of facts not presented to a jury or admitted by him, in violation of the Sixth Amendment. The government responds that Revels admitted the facts underlying the four-level enhancement. Circuit precedent forecloses the government’s argument, and we thus agree with defendant on this issue.
In Booker, the Supreme Court held that “[a]ny fact (other than a prior conviction) which is necessary to support a sentence exceeding the maximum authorized by the facts established by a plea of guilty or a jury verdict must be admitted by the defendant or proved to a jury beyond a reasonable doubt.” 125 S.Ct. at 756. Admissions may take a variety of forms, including guilty pleas and stipulations, see Blakely, 542 U.S. at 304, 310, 124 S.Ct. 2531, a defendant’s own statements in open court, see, e.g., United States v. Henry, 417 F.3d 493, 495 (5th Cir.2005) (per curiam), and representations by counsel, see, e.g., United States v. Devono, 413 F.3d 804, 805 (8th Cir.2005) (per curiam); United States v. Bartram, 407 F.3d 307, 310-11 (4th Cir.2005) (opinion of Widener, J.); id. at 315 (Niemeyer, J., concurring in part and concurring in the judgment). However a defendant admits to facts, they may serve once admitted as the basis for an increased sentence without being proved to a jury beyond a reasonable doubt. See Booker, 125 S.Ct. at 756.
In assessing whether a defendant has made an admission for Booker purposes, verbalizations necessarily fall along a spectrum. On one end of the spectrum are statements such as “I admit,” or the functional equivalent thereof. These are clearly admissions under Booker. See, e.g., United States v. Morrisette, 429 F.3d 318, 323 (1st Cir.2005) (defendant admitted facts where, inter alia, he and his counsel “both conceded the accuracy of the prosecution’s recitation of the facts relevant to the offense”); Devono, 413 F.3d at 805 (defendant admitted facts where, inter alia, defense counsel stated “ ‘we believe[ ] that the facts [in the PSR] are true’ ”). On the other end of the spectrum is silence. In United States v. Milam, 443 F.3d 382, 385 (4th Cir.2006), we held that a defendant’s failure to object to facts in his PSR did not constitute a Booker admission. In Milam, the defendant “stood silent when the court adopted the finding” that enhanced his *451sentence, and we explained that “[t]o presume, infer, or deem a fact admitted because the defendant has remained silent ... is contrary to the Sixth Amendment.” Id.
Though the case before us falls somewhere in the middle of the spectrum, it is closer to Milam than to an affirmative admission, and Milam accordingly binds us here. The district court asked defendant whether he had objections to anything contained or omitted from the PSR, and defendant replied “No, sir.” While this single statement is more than the silence in Milam, it remains the only evidence that defendant admitted brandishing a gun during a robbery. The defendant did, moreover, properly raise a Blakely objection to the constitutionality of the judicial factfinding procedure. Taken as a whole, the facts are thus not sufficiently distant from Milam, and we must hold that Revels did not admit the facts underlying his four-level sentencing enhancement.1 The district court accordingly increased Revels’s sentence beyond that prescribed in the Guidelines on the basis of facts neither admitted by him nor proved to a jury beyond a reasonable doubt. See Booker, 125 S.Ct. at 756. This was Sixth Amendment error. United States v. Hughes, 401 F.3d 540, 547-48 (4th Cir.2005).2
III.
There remains the question of whether the Sixth Amendment error was prejudicial to the defendant in light of the district court’s announcement of an alternative identical sentence treating the Guidelines as advisory only. See Hammond, 381 F.3d at 353-54. Our inquiry, as Booker made clear, is guided by the “ordinary prudential doctrines” of harmless and plain error. Booker, 125 S.Ct. at 769; see also United States v. Rodriguez, 433 F.3d 411, 415 (4th Cir.2006) (applying harmless error review); Hughes, 401 F.3d at 547 (applying plain error review). Because de*452fendant raised a proper objection below, we review for harmless error. See United States v. Olano, 507 U.S. 725, 734, 113 S.Ct. 1770, 123 L.Ed.2d 508 (1993); Rodriguez, 433 F.3d at 415. Under harmless error review, the government must show that any constitutional error did not actually affect the outcome of the proceedings. See United States v. Dominguez Benitez, 542 U.S. 74, 81 & n. 7, 124 S.Ct. 2333, 159 L.Ed.2d 157 (2004); see also Hughes, 401 F.3d at 548. In the context of Sixth Amendment Booker error, the question is thus whether as a result of such error, Revels’s sentence “was longer than that to which he would otherwise be subject.” Id.
We conclude the government has met its burden here. Following our recommendation in Hammoud, 381 F.3d at 353-54, the district court indicated that if the Guidelines were non-mandatory, it would have imposed the same 120-month sentence pursuant to the factors in 18 U.S.C.A. § 3553(a). No guesswork on our part is thus required to conclude that any Booker error did not “actually affect[] the outcome of the proceedings.” Hughes, 401 F.3d at 548. The 120-month sentence was not “longer than that to which [Revels] would otherwise be subject,” because the district court stated that Revels would be otherwise subject to the same sentence. Id. The two sentences the district court announced were, moreover, both issued only after the district court considered defendant’s various requests for a lower sentence and after it stated that the findings in the presentence report were credible and reliable. The district court had also informed defendant at his plea hearing that it planned to set forth an alternative sentence under Hammoud. Revels thus had an opportunity to raise arguments that might have influenced the district court’s consideration, unconstrained by the mandatory nature of the Guidelines. See United States v. Knows His Gun, 438 F.3d 913, 919-20 (9th Cir.2006).
Because any error was harmless, a remand for resentencing is not necessary. Such a remand would, in any event, be little more than an empty formality, for the sentence the district court would impose on remand is a foregone conclusion. See United States v. Christopher, 415 F.3d 590, 594 (6th Cir.2005) (“[W]here the district court makes clear that its sentence would remain the same even without mandatory guidelines, we do not need to read any tea leaves to determine what the district court would do on remand.”) (internal quotation marks omitted). It therefore comes as little surprise that virtually every circuit to have addressed the issue has concluded that an alternative identical sentence treating the Guidelines as advisory renders harmless any Booker error. See, e.g., United States v. Hill, 411 F.3d 425, 426 (3d Cir.2005); United States v. Saldana, 427 F.3d 298, 314-15 (5th Cir.2005); United States v. McBride, 434 F.3d 470, 473 (6th Cir.2006); United States v. Bassett, 406 F.3d 526, 527 (8th Cir.2005) (per curiam); United States v. Robles, 408 F.3d 1324, 1326-27 (11th Cir.2005) (per curiam); United States v. Simpson, 430 F.3d 1177, 1190-91 (D.C.Cir.2005); see also United States v. Knows His Gun, 438 F.3d 913, 917-18 (9th Cir.2006). We join this authority here.
IV.
For the foregoing reasons, the judgment of the district court is
AFFIRMED.