Rachel Uchitel — best known as Tiger Woods Mistress #1 — has announced that she is pregnant! Five months pregnant to be exact.

“Expecting big things for 2012… Five down, Four months to go,” she tweeted Tuesday along with a photo of her new husband, Matt Hahn, rubbing her growing baby bump. “@MattyHahn checking out my baby bump at 5 months.”

According to previous reports from TMZ, 36-year-old Uchitel and 26-year-old Hahn, a former Penn State football player turned San Francisco businessman, got married back in October in a Las Vegas ceremony after dating for several months. The couple currently live together in San Francisco.

Aside from being famous for her fling with Tiger Woods and her $10 million settlement, Uchitel was also in the news in 2010 when “Bones” actor David Boreanaz admitted to having an affair with her while his wife was pregnant.

Uchitel has also appeared on a couple of reality shows, like “Celebrity Rehab with Dr. Drew” and most recently “Famous Food” in an effort to capitalize on the fame she received from having sex with a married pro golfer.

Based on this woman’s “lengthy” track record, we’d advise this new husband of hers to seek out a paternity test as soon as that baby pops out!

Just sayin…