Michael Phelps recruits fellow Olympians, such as Nathan Adrian, behind Phelps, for a Las Vegas Labor Day weekend celebration marking his retirement from competitive swimming. (Erik Kabik / September 2, 2012)

September 3, 2012, 5:06 p.m.

We're guessing any retirement party you've been to didn't include bikini-clad waitresses, chilled vodka shots and world class DJs. But then again, Michael Phelps isn't anywhere near retirement age.

But retire the 27-year-old swimmer did. Following a blaze of glory at the recent London Olympic Games that saw him named the most-decorated Olympian in history, Phelps celebrated the end of his competitive career in Las Vegas.

A Labor Day weekend bash awaited Phelps and athlete pals such as Allison Schmitt and Nathan Adrian, kicking off Friday at the Wynn Encore's Surrender nightclub.

"This is my first night of retirement!" Phelps told the screaming room, taking Grey Goose shots as Afrojack worked the turntables.

The following afternoon at the Encore Beach Club Phelps rolled shirtless in shades with Schmitt and Adrian but not girlfriend Megan Rossee, accepting kudos from party-goers and a cake decorated with gold medals from some scantily clad servers.

David Guetta, he of such hits as "Titanium" and Usher's "Without You," invited Phelps into the DJ booth, prompting cheers of "USA!" from the crowd.

Hotel owner Steve Wynn and wife Andrea Hissom joined the pair to take in the moment -- likely an exciting one for everyone present. After all, this is the kind of Vegas occasion you want documented. Others can be a royal pain.

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Michael Phelps celebrates retirement with Vegas rager