More outrageous news from Tila Tequila: she's pregnant!

After proclaiming her engagement to heiress Casey Johnson Dec. 9, the MTV reality star tweeted her latest "big announcement" Sunday:

"I am going to become a SURROGATE MOTHER for my brother and his Wife!!…That is my xmas present to them," she writes.  "I'm pregnant!!!"

Earlier, she teased that she was giving her brother a present that would "CHANGE HIS LIFE AND MINE FOREVER!!!! ITS HUGE!"

Tila (real name: Tila Ngyuen), 27 has not yet provided additional details about the due date of the child or how she reached the momentous decision.

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She is also apparently being generous with her parents this year — she notes on the microblogging site that she's "going to surprise my Mom & Dad & Buy them a new house in Vietnam where they can retire & B happy."

The star recently showed off her engagement ring from supposed fiancee Johnson. She said it was a "17-carat diamond ring from my baby…My baby takes care of me. Beat that J.Lo! Beat that Khloe and Lamar!"

All the happy news follows darker headlines from Tila: she had recently alleged that her ex-boyfriend, San Diego Chargers quarterback Shawne Merriman, choked and restrained her at his home; her claims were dropped in September due to insignificant evidence.

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