AceShowbiz -

Though Blake Shelton and Gwen Stefani have been dating for only five months, it seems like the two already have babies on the brain. According to In Touch, the "Hollaback Girl" singer wants to give the country crooner a biological baby.

The news outlet claimed that Gwen wanted to give another sibling for sons Apollo, Kingston and Zuma. "Gwen is freezing her eggs because she wants to have a baby with Blake. She'd love to have a girl - plus Gwen knows her boys would love to have another sibling - and wants to give Blake this opportunity to have a child that's biologically his," the source suggested.

"Even though Blake says having a biological child doesn't matter to him, Gwen will do whatever it takes to make certain that if he changes his mind, the eggs will be frozen and available," the source continued.

The source went on to claim that Gwen didn't want her age to prevent her from giving Blake a child, so they're considering using a surrogate. "They have discussed using a surrogate. Blake is very touched Gwen is going to such great lengths to make him happy, especially since there is absolutely no pressure on her to do it. But he will be by her side for the process, which can be painful," the source added.