Reality TV star Tila Tequila has topped her bizarre online update announcing her engagement to a billionaire heiress - by telling fans she's pregnant with her brother's baby.

The pint-sized pin-up claims she has stepped up to be the surrogate mother for her brother and sister-in-law, and that she is in the first stages of pregnancy.

On her Twitter.com page, she writes, "BIG ANNOUNCEMENT: I am going to become a SURROGATE MOTHER for my brother & his Wife!!! That is my xmas present to them. I'm pregnant!!!! THIS WIILL CHANGE HIS LIFE & MINE FOREVER!"

The strange announcement comes just weeks after she confirmed she was engaged to Casey Johnson, the heiress to the Johnson & Johnson fortune, via an internet video just hours after the pair fell for each other.

Johnson's ex lover, Courtenay Semel, later claimed the engagement ring her former partner proposed with was a fake and the same one Johnson gave to her earlier this year.

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(This news article provided by World Entertainment News Network)