"They are in the final stages of choosing the woman who will carry their baby. It’s extremely important to Gwen that she give Blake a biological child, and Blake is so excited," the insider reportedly said.
Stefani, 49, and Shelton, 42, have been dating for about three years. Stefani has three sons (Kingston, 12, Zuma, 10 and Apollo, 4) with ex-husband Gavin Rossdale. Shelton divorced country star Miranda Lambert in 2015.
Resource: USA Today