Has Cameron Diaz lost her marbles and shaved off all her hair?!  She and Britney may have an ex-boyfriend in common but one thing they do not share is a panache for shaving their head when they get a little stressed. Cameron's chrome dome is due to a role in her new movie My Sister's Keeper. Cameron plays a mom whose daughter (Sofia Vassilieva) looses her hair after being treated for leukemia and shaves her head in support; Abigail Breslin plays her sister.

       

Cameron Diaz hit the red carpet looking radiant last night, marking her return to Hollywood since the tragic loss of her father two weeks ago.  Cameron was at the Village Theater in Westwood to premiere her new movie What Happens in Vegas with co-star Ashton Kutcher.  Also on hand for the event were Lake Bell, Diablo Cody, Eva Longoria, Soleil Moon Frye (Punky!) and Bai Ling, cuz what's a red carpet with out that ding bat?

       

Cameron Diaz's ex-boyfriends, Justin Timberlake and John Mayer, came out to show their support at a memorial service yesterday in honor of Cameron's late father Emilio.  Emilio Diaz, only 58,  died suddenly last week of pneumonia and yesterday the Diaz family had a "celebration of life" at Mahe in Los Angeles to honor him.  Guests did not dress in drab black, but rather wore brightly colored attire and gave toasts to honor their friend and relative.  Cameron issued a statement saying "His humor and spirit will always live on in our hearts."

     

On the set of their new movie that is!  Cameron Diaz and Jason Patrick are currently filming My Sister's Keeper in Los Angeles along with their lil co-star Abigail Breslin. 

      

Cameron Diaz was clearly having fun when we caught up with her on the set of her new movie, My Sister's Keeper, in Los Angeles. Gone are the days when she was dating Justin Timberlake and she spent her time being miserable and attacking photographers. She's much happier, and it shows in these pictures where she's fooling around with fellow cast members.

Cameron Diaz seems to be enjoying herself on the set her new movie, My Sister's Keeper.  Based on the same name, Cameron will play the mother to her co-star Abigail Breslin.

Cameron Diaz was looking pretty hot today on the New York set of 'What Happens in Vegas'. Cam let her hair down and pulled a costume change mid-scene - from conservative black and white office attire, to electric-blue cocktail dress. We reckon whatever she wears, she looks electric.

Cameron Diaz celebrated the big 3-5 on the New York set of her upcoming movie 'What Happens in Vegas'. Cam was unfortunately tied up filming late into the evening and wasn't able to enjoy a night out (with John Mayer?) to celebrate. Maybe it'll happen tonight.