If imitation is the sincerest form of flattery, Vince Vaughn should be feeling pretty good right about now. His ex, Jennifer Aniston, 37, showed off a serious sparkler Bulgaris 11-carat canary diamond ring worth $520,000 bearing a striking resemblance to the $500,000 engagement ring Vaughn, 36, gave her (which she has since returned to him) last year. Was she sending a message? I think it was a goodwill gesture, saying shes OK with it all, says Judith Orloff, a UCLA psychiatrist. A Fabrikant source tells Us, Its certainly an interesting choice!