The actress gave birth in London on Thursday, May 30, according to Us Weekly.
Gossip Cop has reached out to reps for the pair for confirmation.
The newborn would be the first child for Tatum and Dewan, who wed in 2009.
In April, Dewan showed off her baby bump in Glamour.
SO.... is it a girl? a boy? name? and yes, I am incredibly jealous....
Channing Tatum and Jenna Dewan-Tatum are first-time parents! The couple welcomed their first baby together in London on Thursday, reports Us Weekly. The gender of the baby is not yet known.
Tatum, 33, and Dewan-Tatum, 32, announced in December that they were expecting their first child. The couple met on the set of the dance flick Step Up in 2006, and married in July 2009.
The White House Down actor recently told Cosmo that the secret to their nearly eight-year-long relationship is that "You have to want it. Jenna's and my thing is checking in with each other all the time, like 'On a scale from 1 to 10, how much do you love me right now?' And you gotta be honest, and you've got to want an honest answer."