CISCO ADLER has lashed out at Paris Hilton over her petty feud with his girlfriend Mischa Barton, insisting the heiress should "butt out and get a job."

The Whitestarr frontman stood up for Barton as he blasted the blonde socialite for her wild lifestyle and lack of talent.

He says, "Has Paris nothing better to do than party and row with people? At least Misch has a job. She's a respected actress, what's Hilton got going for her?"

THE OC star, 20, reportedly fell out with the socialite, 25, when she began dating Adler, who is Hilton's best pal Kimberly Stewart's ex-fiance, and formed a close friendship with Hilton's former friend Nicole Richie.