They were both spotted at CAA and Grey Goose vodka's annual CAA Foundation soiree at Soho House in West Hollywood.
So how are things between the two?
They certainly didn't show any love last night.
A source reports that they were seen most of the evening at opposite ends of the bash. At one point, the Two and a Half Men star was seen walking by Moore, but they didn't acknowledge one another.
Moore chatted a bunch with just-announced Globes presenter Madonna, who was holding court in the members-only club's garden area. The Material Mom, whose ex Sean Penn was also there, made quite the fashion statement in a red dress with matching leather gloves.
Moore definitely didn't look as downtrodden as she did during the first days of the breakup. She was all smiles and showed off her body in a slinky, sleeveless silver dress.
A very blond Cameron Diaz walked into the bash on the arm of her Knight and Day costar, Tom Cruise. Once inside, Diaz hung out—and danced!—with her sometimes-rumored-to-be main man, Sean "Diddy" Combs.
Rounding out the guest list were Leonardo DiCaprio, Orlando Bloom, Eva Mendes, Robert De Niro, Kate Hudson, Robert Downey Jr.., Steven Tyler, Gerard Butler, Helen Mirren, Salma Hayek, Alexander Skarsgård, Lisa Kudrow, Julianne Moore, Nick Nolte, Benicio del Toro, Jamie Foxx and Jason Bateman.
You can check out some photos from the bash over at our Hollywood Party Pics gallery.
Also last night, Seth Rogen, Ty Burrell, Paul Rudd, Sophia Bush and Jack Black were at Vibiana in downtown Los Angeles for the Hilarity for Charity event benefiting the Alzheimer's Association. Bruno Mars sang a parody of Céline Dion's Titanic hit, "My Heart Will Go On." DJ Pauly D also provided tunes throughout the show.