"BIG ANNOUNCEMENT: I am going to become a SURROGATE MOTHER for my brother & his Wife!!!" she Tweeted.
The news comes as an early Christmas gift to her family – she says she's already with child.
"That is my xmas present to them," she continued. "Im pregnant!!!!"
While the "A Shot At Love" star will have to abstain from her favorite beverage for the next nine months, she seemed excited about her baby news.
"THIS WIILL CHANGE HIS LIFE & MINE FOREVER!!!!!" she Tweeted.
Tila announced her engagement to Johnson & Johnson heiress Casey Johnson earlier this month via her uStream account.
In other Tila news, San Diego Chargers linebacker Shawne Merriman has sued Tila for copyright infringement, according to the San Diego Union-Tribune. He reportedly alleged that the star posted photos of himself and his "Lights Out" trademark on her Web site without permission. The suit follows Tila's own lawsuit against the football star, which alleged that he assaulted her as she attempted to leave his residence in September 5. No criminal charges were filed over the alleged incident due to insufficient evidence.
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