Chad Lowe and his girlfriend Kim Painter have welcomed a baby girl, his rep confirms to Usmagazine.com.

Mabel Painter Lowe was born on Saturday in L.A., his rep continues.

See adorable photos of star babies.

"Everybody is healthy and happy," the rep goes on.

The couple said they were "overjoyed and could not be happier," after announcing Painter's pregnancy in January.

Can you guess the celeb baby bump?

The Bones guest star, 41, and Painter, a producer, first began seeing each other in 2007. He split from actress Hilary Swank in 2006.