They hosted Casamigos karaoke -- you know, Casamigos, the tequila brand Gerber and George Clooney started because they can.
Sources tell us they danced and partied Sunday night. Tennis legend John McEnroe sang David Bowie’s "Rebel Rebel" with the entire Northwestern women's lacrosse team.
Ex-NHL hockey star Chris Chelios sang too, and even if you look closely in this video you'll see Wayne Gretzky's wife, Janet, leading the dance.
Looks painful -- all that carefree fun and merriment.