Tiger Woods' number-one mistress is about to become a mom. The 36-year-old reality star is pregnant with her first child by husband Matt Hahn. The newlyweds tied the knot in October, and just last month the Celebrity Rehab star told Radaronline.com that a baby was in the future. So it was a shotgun wedding after all. Yesterday Uchitel confirmed that she was, in fact, with child, Tweeting, "Expecting big things for 2012... Five down, Four months to go..." followed by "checking out my baby bump at 5 months..." She posted pics with Hahn and her growing belly on full display. Uchitel's seasons' greetings are a sharp contrast to those of two years ago when Woods' wife Elin Nordegren learned of his extra-marital affair with Uchitel. She was the face that would inevitably launch a thousand mistresses. Well, at least 12. After being paid off handsomely by Woods' camp, Uchitel went on to appear on VH-1's Celebrity Rehab with Dr. Drew where she was treated for her "love addiction." In other pregnancy news, model Alessandra Ambrosio's secret is out. She is pregnant with her second child by fiance Jamie Mazur. Ambrosio is four months pregnant and tells Us Weekly she can't wait to expand her brood, "Family is the most important thing for me and I'm thrilled to be adding to the family. I'm fortunate to have a loving and supportive family. It's a blessing that it will soon be growing."