Gwen Stefani Revenge: Blake Shelton 'Loves' Kids, Gavin Rossdale Jealous & Heartbroken?

The more Gwen Stefani's romantic relationship with Blake Shelton grows, the angrier ex-hubby Gavin Rossdale gets (apparently).

While 46-year-old Stefani isn't ready to start a new family with the 39-year-old country music superstar quite yet, he's definitely already getting close to her young sons. And Rossdale can't stand it:

"Blake is amazing with the kids. He's such a big kid himself and loves doing all the same things as they do," an alleged insider tells the popular gossip webloid HollywoodLife.com. "One of his favorite things to do with them is go on hikes - they love Malibu Creek. They get out there in the mud, hunting for frogs or playing hide-and-seek. Blake loves any excuse to get outside and get dirty, so he's a big hit with Gwen's kids. It drives Gavin nuts that his kids have bonded with Blake. He hates that they're spending so much time with him. He doesn't have any say in it... and it's killing him." 

Even so, the Bush frontman still seems to be enjoying his time with Mindy Mann, the stunning nanny whom he supposedly cheated on Stefani with during their marriage.

The former couple share three boys together - Kingston James McGregor (9), Zuma Nesta Rock (7), and Apollo Bowie Flynn (2). Wonder if they enjoy spending so much time with their mom's new "The Voice" boyfriend? Shelton had no children with ex-wife, Miranda Lambert.

Lucky for Stefani, playtime isn't over when the kids go back to their dad...

"Blake is very passionate [and] very uninhibited. He's suggested some crazy things, like having sex outside," another source reveals. "Gwen has to guard her privacy carefully so that would be a hard one for her, but he's loosened her up a lot. So who knows, maybe next time they go to Oklahoma he'll get his wish." 

Do MstarsNews readers still think they make a cute pair?