Jessica Simpson Fights Back on ‘Fashion Star’ [Video]

Oh, it's on now! "Fashion Star" mentor Jessica Simpson gets into it with a contestant over the always controversial topic: the placement of zippers on a jacket.

In an upcoming episode of NBC's new fashion reality series (which debuts March 13), designer Nicholas Bowes, who hails from Australia, presents his biker jacket for the mentors' inspection. John Varvatos says it's a bit on the "meh" side, which Nicholas seems to acknowledge. However, once Simpson starts in on the zippers, Nicholas just can't stay quiet.

"I think it's a very fashion-forward piece," Nicholas says. "If you understood what's going on right now, you'd probably understand that that's what's going on right now in men's fashion."

[Related: Pregnant Jessica Simpson Bares All for Elle]

After third mentor Nicole Richie echoes Simpson's critique of Nicholas's line, Simpson fires back at the designer, saying that she's "a little bit offended -- not a little bit -- a lot a bit. To talk down to a woman in this business? We're running the world right now, OK? I really wanna hit you across the face right now..."

Bottom line: If J-Simp says you have too many zippers, just smile and nod, lest you feel her wrath.

"Fashion Star" premieres Tuesday, 3/13 at 9:30 PM on NBC.