Gavin Rossdale Doesn't Like Blake Shelton Bonding With His Kids, Source Reveals

Inside Gwen Stefani and her ex-husband's "bad blood" relationship

It looks like there is trouble in paradise.

Gwen Stefani and Blake Shelton's relationship continues to get more serious, but there's one person who isn't too happy with Blake's involvement with Gwen's kids: Gavin Rossdale.

A source tells E! News that Gwen's ex-husband doesn't want his kids, Kingston Rossdale, Zuma Rossdale and Apollo Rossdale, getting close with the country crooner. "Gavin doesn't agree with [Gwen] having a relationship with Blake, and he doesn't like her bringing the kids around him," the insider shares.

Unfortunately, the divorce has caused a "bit of bad blood" to run through both Gwen and Gavin, a second source explains. Over the past few months, Gwen's kids have gotten close with Blake and have learned to "love him," although that's hard for Gavin to bear.

"If it were up to Gavin he would want to work it out with Gwen," the second source shares. "He is still hurt it has turned out this way and now she is in love with another man."

As for Gavin, he's "not dating anyone right now."

A publicist for Gavin couldn't be reached for comment.

Blake and Gwen put their love on center stage, literally, Sunday when they performed their song "Go Ahead and Break My Heart" during the Billboard Music Awards. Once cameras stopped rolling, an eyewitness told E! News that Blake grabbed Gwen's hand as they relaxed and took their gear off on the stage. "They looked very in love during the song and after," our eyewitness said.

"And when Blake grabbed her hand, it was like he was very proud to be up there with Gwen. He looked at her like he is crazy about her."

Just last month the No Doubt songstress and Gavin reached a settlement in their divorce, which they originally filed for in August 2015 after Gavin allegedly had an affair with their nanny Mindy Mann.

According to the documents, obtained by E! News, Gwen was to keep all the rights to her music from No Doubt, while Gavin would keep the rights to his Bush music. Gwen would also have complete control over her fashion lines, L.A.M.B. and Harajuku Lovers; however, the singer agreed to put 25 percent of her L.A.M.B profits in a trust, presumably for their three kids.

Neither would receive child or spousal support and agreed to share joint legal and physical custody.