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Ali Larter is one hot momma!

The Resident Evil star donned sexy skintight spandex, and a drool-worthy $3,000 Chanel bag, as she stopped by a friend's house in Brentwood, on Sunday.

Larter has been busy prepping for her son Theodore's big first birthday party (today!) and the whole family is headed to Chicago to celebrate.

"We’re doing a big one on the actual day in Chicago where my husband's family is, and we’ll do a mini one with my family," the actress tells People.

Happy first birthday Theo!