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There could be another voice coming into Gwen Stefani and Blake Shelton's relationship.

According to Us Weekly, the couple is opening talking about having a baby together.

The in-your-face couple, who's been dating since October and have been fairly inseparable since, "talk openly about their future together."

"They say things like, 'When we get married . . . all the time," the source said.

Not only that, but it sounds like Gwen is very interested in having a child with the country superstar. She "is totally smitten and wants to have a baby with Blake," one of Gwen's pals told the Us Weekly, adding, "Gwen is trying to get pregnant."

Gwen already has three children with ex-husband Gavin Rossdale, Kingston, 10, Zuma, 7, and Apollo, 2. It was reported last week that Gavin has issues with Blake being involved in his children's lives and staged a secret meeting with the "Hollaback girl" singer.

Gavin "wants to be consulted on everything concerning the kids and the role that Blake is playing in their lives," the pal said.

Blake has been very involved in the three children's lives since he began dating their mother. Over Memorial Day Weekend, Kingston Rossdale marked his 10th birthday with an outdoor adventure-filled weekend chock-full of fishing, four-wheeling and frog-catching at what appears to be Blake's Oklahoma ranch. The next day, he went on a helicopter ride! Over Easter, he hosted his girlfriend and her boys (as well as her brother Todd) at his ranch, as well.

The kids have become "closer and closer" with Gwen's sons, says a separate source. "The boys love him."

For Blake, children is apparently something he's always wanted. It was rumored that his desire for children was one of the reasons that he and Miranda Lambert divorced last summer. She kept putting it off, but he wanted them soon.

"Gwen says she wants to give Blake his own kid," the first source said, adding that Gwen actually wants a girl.

The second source told the magazine, "Blake always wanted a family, and it's looking like he got one."