Dewan-Tatum reportedly gave birth at a London hospital on May 30, reported Us magazine.
Tatum and Dewan-Tatum met on the set of "Step Up" in 2006. After dating for three years, the couple tied the knot in July 2009 and announced that they were expecting a baby together last winter.
"I thought my body was going to change so quickly with pregnancy that I'd freak out. But it was really gradual. There's a reason women are pregnant for nine months; by the end, you're ready to have this baby," she said.
"He takes the route of no confrontation, just support, saying things like, 'Do whatever you want! What do you want to eat? I'm going to leave it up to you'.