Rachel Uchitel, perhaps Tiger Woods' most infamous mistress, took to Twitter to reveal that she is pregnant with her first child with husband Matt Hahn.

Uchitel posted two photos of herself showing off a burgeoning baby bump with the captions Expecting big things for 2012... Five down, Four months to go... and @MattyHahn checking out my baby bump at 5 months...

The Daily Mail is reporting that the mama-to-be has asked friends to choose from a list of 50 gifts for her shower, including a $1,000 stroller and $300 nipple pumps.

Though she did not admit the sex, the registry says that their baby girl is expected on May 12, 2012.

She found out she was pregnant when she auditioned for The Amazing Race, a source confirmed to Life & Style Magazine.

They were going to try out to be a couple on the show, and when she had a drug test, it came back positive that she's pregnant!

The 36-year-old married Hahn in October 2011. Hahn, who is just 26, was a football player at Penn State and is now an insurance underwriter. The couple said their vows in front of 12 friends at The Little White Wedding Chapel in Las Vegas, after having met in November 2010. They lived together in New York for several months before moving to San Francisco shortly before the wedding.

This is the second marriage for Woods ex-mistress. She married Wall Street stock trader Steven Ehrenkranz in 2004. They were married for just four months.

Uchitel rose to fame when she became the first mistress to reveal golf superstar Tiger Woods' infidelity. This led to numerous other women coming forward with scandalous details about the sports legend.

Uchitel later appeared on VH1's Celebrity Rehab with Dr. Drew. She claimed she was seeking help for love addiction.

She was first in the headlines days after Sept. 11, 2001, when her photo appeared on the front page of the New York Post. The photo showed her crying, desperately searching for her fiancé, investment banker James Andrew O'Grady, who died in the attacks on the World Trade Center.