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.
Rob Schneider just put his foot in his mouth in a MAJOR way. On Monday, Congressman and civil rights leader John Lewis took to Twitter to honor Martin Luther King Jr., and the Waterboy alum felt the need to chime in for some reason.
The 53-year-old went on social media to try to explain MLK Jr.'s significance to the politician, on Martin Luther King Jr. Day of all days.
But, considering the 76-year-old is actually the last surviving member of the "Big Six" civil rights leaders responsible for creating 1963's March on Washington, and has actually PERSONALLY worked with the iconic activist, we're not sure why he needed a history lesson from a man who couldn't keep his CBS sitcom on the air for more than two months...
However, Rob threw in his two cents anyway, saying: