Jennifer Lopez My Grudges Are Gone, Girl

10/12/2014 2:57 PM PDT
Jennifer Lopez is all about her ex-boyfriends this week ... first she hung out with Diddy at a nightclub -- then she checked out her ex-fiance Ben Affleck's hit movie, and offered some strange proof.

Lopez went to see "Gone Girl" Saturday night ... which we know because she posted a pic of her feet up in the theater with the caption, "#GONEGIRL." Weird, but maybe her booty isn't the only thing fans dig. 

As we previously reported ... Diddy reunited briefly with J.Lo at Hooray Henry's this week.

Cris Judd ... Casper Smart -- keep your dance cards open.