Getty Images for Gabrielle's Angel Foundation

Blake Lively has no problem showing off her baby bump in public, but she and Ryan Reynolds won't be revealing their first child's gender until they find out -- in the delivery room!

"Blake and Ryan aren’t finding out what they’re having," the insider tells Us Weekly. "They want to be surprised!"

The former Gossip Girl starlet announced that she was pregnant last month on her lifestyle website Preserve. At an event last month, Blake gushed to the mag, "He’s always good to me. That’s like a jerky thing to say because you want to be able to complain about your husband and be that person, but he takes pretty good care of me."

Blake and Ryan have been together since 2011, and in 2012 they got married at Boone Hall in Mount Pleasant, South Carolina. Either way, that's going to be one beautiful baby!