Showcasing his iconic "Phelps Face," the swimmer recreated the 8 Mile anthem rocking a Slim Shady-esque hoodie in a gritty bathroom that looked like it was just used by Ryan Lochte — but Phelps was far from the only knockout performance of the evening.
Being the competitor that she is, Munn knew the only way to outperform an Olympian is with the help of more Olympians. So, she enlisted in gymnasts Simone Biles and Aly Raisman for her circus rendition of Sia's Cheap Thrills. (Who needs Dancing With The Stars?)
The celeb cameos didn't stop there — Stevie Wonder made a special appearance during Legend's in character performance of OutKast's Hey Ya, making his wife Chrissy Teigen swoon from her DJ booth.