London: It seems that ‘Charlize Theron ‘ star Cameron Diaz is taking her fitness regime very seriously as she showed off her muscular look at the Annual CinemaCon convention in Las Vegas.

The 38-year-old actress, who is dating baseball player A-Rod, seemed to have packed in muscles when she was picking an award.

Diaz, who accepted the prize for 'Female Star of the Year' from Drew Barrymore, was wearing a strappy, fitted white dress for the occasion, which showed off her recently acquired biceps.

 A-Rod's ex-wives Cynthia and Madonna also had well-toned biceps.