Rachel Uchitel

Rachel Uchitel, well-known for her alleged affairs with golf pro Tiger Woods and Bones star David Boreanaz, is pregnant with her first child, she and husband Matt Hahn announced on Twitter Tuesday.

"Expecting big things for 2012," she posted, along with a photo of her baby bump. "Five down, four months to go."

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The Celebrity Rehab star wed Hahn in October. She was previously engaged to investment banker James Andrew O'Grady, who died in the 9/11 attacks, and married Steven Ehrenkranz in 2004, though their union lasted only four months.