Uchitel gave birth to her "healthy and beautiful" first child on Tuesday (May 15), according to her spokesperson.
Her rep also told Us Weekly: "Both Rachel and baby are resting comfortably."
Uchitel first announced her pregnancy in December, several days before further revealing that the baby would in fact be a girl.
The former Celebrity Rehab star shot to fame in late 2009 when rumours of her alleged affair with Tiger Woods were leaked in the press.
Uchitel has largely shied away from the spotlight since marrying Hahn in Nevada in October.