Kill Bill actress Uma Thurman became a mom for the third time over the weekend. The 42-year-old A-lister welcomed a baby girl with longtime boyfriend Arpad Busson. So far the name of Thurman's new bouncing bundle of joy has yet to be released. However, a rep tells E! News mom and baby are doing just fine: "Uma and baby are doing well." Uma has two children -- 14-year-old Maya and 10-year-old Levon -- with first husband and actor Ethan Hawke, while Busson has two sons -- 14-year-old Flynn and 9 1/2-year-old Cy with ex-fiancee Elle MacPherson. Thurman and Busson first got together back in 2007 but split two years later. They rekindled their romance in 2011. And the rest, as they say, is baby-making history.