JENNIFER ANISTON had a blow-out 50th birthday party Saturday night at the Sunset Tower Hotel in L.A., and everybody was there . . . including BRAD PITT!
Don't get too excited. There's absolutely no indication that they're getting back together, no matter how bad you want it. But a source says she was happy he came, and they, quote, "hugged and chatted for a bit."
So who else was there? For starters, Brad's other ex, Gwyneth Paltrow , and Jennifer's other ex, John Mayer . . . plus John's ex, Katy Perry . . . and her current man Orlando Bloom .
Plus Jennifer's "Friends" co-stars Lisa Kudrow and Courteney Cox . . .
Along with George and Amal Clooney , Robert Downey Jr. , Ellen DeGeneres , Barbra Streisand , Kate Hudson , Laura Dern , Demi Moore , David Arquette , Pharrell Williams , and for some reason, Keith Richards .
Oh, and Reese Witherspoon . . . who partied so hard she fell down some stairs on her way out.