Brian To / WENN 1 / 11
Brian To / WENN 1 / 11

Halle Berry is keeping active as her pregnancy progresses -- she hosted a charity walk in Los Angeles on Saturday.

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The Oscar-winning actress helped launch the 2013 EIF Revlon Run/Walk For Women, an annual fundraiser in aid of cancer research, treatment and counseling. Actress Julie Bowen also took part in the 3.5 mile challenge, and later shared her experience with her Twitter followers.

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In a post, Bowen writes, "Huge thanks to all the volunteers at Revlon Run today. ESPECIALLY the Air Force in boiling hot uniforms. (And gloriously huge Navy guy.)"

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Berry is expecting her first child with French fiance Olivier Martinez. The baby will be a sibling for her daughter Nahla, whose dad is model Gabriel Aubry.