Rod Stewart's ex-wife RACHEL HUNTER stormed out of a live radio interview with American shock jock Howard Stern after a vicious row on air.

The New Zealand-born catwalk queen was furious when she discovered the interview was being filmed and told Stern, "This is f**ked up."

After she had got up to leave, Stern launched an astonishing attack at Hunter, yelling, "She f**ked Rod Stewart, big deal. That's your accomplishment.

"She's too fat to model. She's got a big fat a** and back fat. I hate her."