Britney Spears says she once made out with Ben Affleck - only to later forget about the tryst. The singer made the claim on Instagram, where she posted a throwback pic taken years ago of her with the actor and songwriter Diane Warren. In the Instagram caption, Spears claimed the kissing happened the night the photo was taken. “Cool pic of me and Ben Affleck and Diane Warren years ago!!!” she posted to Instagram. “He’s such an amazing actor. Did I fail to mention I made out with Ben that night … I honestly forgot ... damn that’s crazy !!! Wish I could tell you guys the story that happened before that !!! Oh dear, I’m just being a gossip girl. Psss I actually forgot!”