Red Carpet Sinner!

Hayden Panettiere (with Heroes co-star Greg Grunberg) attended the launch of the Ford Flex Crossover in Los Angeles on Saturday.

Milo‘s girlfriend showed off a new, shorter ‘do.

Thoughts????

While we’re undecided about the hair, one thing is for sure.

She should NOT be chewing gum while walking down the red carpet!!!!

[Photo via AP.]