Jennifer Lopez made headlines when she announced that she wouldn't return to "American Idol" for a third season, and now she's speaking out on her diva replacement, Mariah Carey!

"Extra" correspondent Terri Seymour caught up with the J.Lo backstage at her concert in San Jose, where she asked the popstar if she thinks Mimi will be a tough "Idol" judge.

"I don’t know. I don't know her personality that well," Lopez replied. "I think she'll enjoy it, is what I can say. I did."

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Watch the video above to see J.Lo describe how she agonized over the decision to not return to the hit FOX series, discuss why her surprise 43rd birthday party from boyfriend Casper Smart ended up not being much of a surprise, and debate whether or not she'll ever get plastic surgery!

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