Expectant actress Halle Berry is keeping active as her pregnancy progresses - she hosted a charity walk in Los Angeles on Saturday (11May13). The Monster's Ball star helped launch the 2013 EIF Revlon Run/Walk For Women, an annual fundraiser in aid of cancer research, treatment and counselling. Actress Julie Bowen took part in the 3.5 mile (5.6 kilometre) challenge, and later shared her experience with her Twitter.com followers. In a post, she writes, "Huge thanks to all the volunteers at Revlon Run today. ESPECIALLY the Air Force in boiling hot uniforms. (And gloriously huge Navy guy.)" Berry is expecting her first child with French fiance Olivier Martinez, a sibling for her first daughter, Nahla, by model Gabriel Aubry.