Rachel Uchitel really is a mother -- she gave gave birth to a healthy baby girl Tuesday evening in San Francisco.
TMZ's learned Rachel and husband Matt Hahn welcomed their daughter -- 7lbs. 1oz. -- at 5:04PM PT.
Just a couple weeks ago, the 37-year old former Tiger Woods mistress one-upped Demi Moore's famous Vanity Fair cover by posing in a sheer sheet ... and while flashing a thong.
According to Matt's Facebook the little girl's name is Wyatt Lilly -- a real pistol. Just like Mom.