Notoriously thin Nicole Richie has been called lots of things, but buff is not one of them. However, that all might change -- the petite socialite has been working out lately to prepare for her role role in the TV show Chuck. According to Richie, "In 'Chuck', I play a cheerleader who ends up in a huge girly fight with an old classmate. We had a week of intense training with a martial arts guy to get ready for this scene and I loved every minute of it. If I had any baby weight left, that definitely got rid of it."

And it looks like she's planning on keeping up her healthy routine -- according to sources, she's hired celeb trainer Harley Pasternak to whip her into shape. But it's not for health reasons -- says one friend, "Nicole feels huge right now. Her breasts are enormous and she finds it difficult to get comfortable. The change to her body has been drastic and it's been hard for Nicole to accept. She looks in the mirror and doesn't even recognize the person staring back at her."

She feels huge? I think she looks great with a couple extra pounds -- better than she has in years. Your thoughts?