Sophia Bush & Christa B. Allen: AIDS Walk!

Sophia Bush dons a heart t-shirt while attending the 2012 AIDS Walk Los Angeles on Sunday (October 14) in West Hollywood, Calif.

The 30-year-old Partners actress was joined by her co-star Michael Urie and Christa B. Allen.

PHOTOS: Check out the latest pics of Sophia Bush

The AIDS Walk Los Angeles helps “provide urgently needed care to thousands of people living with HIV, as well as vital prevention work that reaches many more throughout the Southland.”

Later in the day, Sophia was spotted all dressed up for the Rape Treatment Center Fundraiser, alongside Viola Davis.

FYI: Christa is wearing the exclusive A|X Armani Exchange Aids Walk T-Shirt.

25+ pictures inside of Sophia Bush, Christa B. Allen, and Michael Urie at the AIDS walk…