We're almost sick of seeing her everywhere we look, but when Jennifer Aniston appeared on The Tonight Show Starring Jimmy Fallon on Wednesday evening, she totally made us crack up.

Jen and Jimmy played a game of lip flip, and she did an amazing job keeping a straight face as she attempted to go along with the words coming out of his mouth. Then the two got to talking about the Super Bowl, at which point Jen (well, Jimmy) started talking about marijuana. We honestly can't even describe this -- you just have to watch it!

On a more serious note, Jen's Hollywood Reporter cover story hit the web yesterday, and not only does she talk about Justin Theroux, but she recounted some painful details from her childhood. Jen opened up about her rocky relationship with her mom Nancy Dow, who penned a tell-all book about the two back in 1999 when Jen was at the height of her Friends stardom.

"She was critical. She was very critical of me," she tells the publication. "Because she was a model, she was gorgeous, stunning. I wasn't. I never was. I honestly still don't think of myself in that sort of light, which is fine." Er, how uncomfortable!