TMZ Live: Mariah vs. Nicki ... How the WAR Began

(0:00) It's one of the craziest videos we've ever seen -- Nicki Minaj going crazy on Mariah Carey duing an "American Idol" taping ... and we'll tell you what set the whole thing off.
(10:30) Breaking news -- Ashton Kutcher just got Punk'd ... with a new, ridiculous trick called "swatting." And it's not funny.
(12:00) Chris Brown and Rihanna hung out at a club ... then at her hotel. The question: Would you feel sorry for her if he beat her up again?
(16:10) Justin Bieber's ridiculous car got towed -- while he was performing at the Staples Center. So who was the dummy that parked it in a 15 minute spot?
(18:00) Richard Belzer joins the show -- you gotta see him and Harvey go toe-to-toe over Richard's Nazi salute.
(27:10) Playboy model/real housewife Joanna Krupa is NOT a prostitute ... and she's ready to sue to prove it.
(29:00) AJ McLean loves ass.
(30:30) Chris Cornell's maid says she got screwed over wages.
(32:00) Winona Ryder is back!!! And hotter than ever.
(33:20) Matt Barnes called a cop a p**sy and a fa**ot ... so which one is more offensive?
(37:10) Jason Russell -- the guy behind the Kony video -- is finally opening up about his naked meltdown. You buying what he's selling?
(40:00) We take your calls!