Mischa BartonMischa BartonMischa Barton is having a downer.

Someone's got her disgruntled - but who?

Her very own self, that's who.

Mind you, we'd be worried if she wasn't slightly concerned about her Crimbo behaviour.

She's been chatting about her drink-driving arrest on 27th December 2007 for the first time.

She told Ryan Seacrest's KIIS-FM radio show: "I got a DUI when I was back in LA.

"I was pulled over. Obviously, I am 100% responsible for my actions, and I am really disappointed in myself.

"I am not perfect, and I don't ever intend to do something that stupid again."

And she also fessed up to not having a valid licence: "I usually try not to get behind the wheel."

"It is tough when people are talking about you all the time.

"You just have to roll with it. I feel like I've got my head on my shoulders pretty good."

If you say so Mischa.