Michael Phelps (Gallo Images/Rex / Rex USA)

Michael Phelps celebrated his retirement in Las Vegas over the weekend. The Olympian idol was spotted with pals Friday at club Surrender, where he was welcomed with deafening cheers as DJ
Afrojack spun. Phelps exclaimed “This is my first night of retirement!” then threw back a shot of chilled Grey Goose vodka. The celebration continued the next day at Encore Beach Club, where Phelps was seen partying in a luxury bungalow while David Guetta spun, and Steve Wynn congratulated Phelps.