Gwen Stefani and her new boyfriend, Blake Shelton, are reportedly moving fast.

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Although The Voice co-stars' romance was confirmed just weeks ago, a new report claims Stefani has already introduced Shelton to her sons.

“Blake has met Gwen’s boys and apparently has won them over and is a big hit,” an insider told Hollywood Life. “Everyone knows that Blake is a big kid himself. For Gwen, it’s an added bonus. Watching how well he interacts with her children makes Blake that much more attractive to her.”

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“For Gwen, it’s an added bonus. Watching how well he interacts with her children makes Blake that much more attractive to her,” the insider continued.

While Stefani and Shelton appear to be enjoying their new romance, and the possibility of a future together, a second report claimed Stefani's ex-husband, Gavin Rossdale, the father of her children, wasn't too thrilled to hear of the speedy introduction.

“Gavin is confused that Gwen is moving on so fast and is worried that it will not be good for the children” a second Hollywood Life insider explained. “Gavin is hurt, but he is being strong — it is really all about how his kids will take the news that he’s most concerned about. When it comes down to it, Gavin wants what’s best for the kids. He knows Blake is a good guy, but Gavin feels he is coming in a little too early and taking advantage of a weaker Gwen.”