Gwen Stefani and Blake Shelton are now officially dating and as expected, their former partners won't be happy about it. Miranda Lambert may be taking it quietly, but Gavin Rossdale is said to be more vocal about it.

Gwen and Blake have been hitting the headlines for quite some time now, and the latest reports reveal that the Bush frontman is having a hard time accepting that his ex-wife has moved on too quickly. A source told Radar Online that the father of three thinks the "Used To Love" singer is using their divorce to promote her album. The insider went to add that she is reportedly dating the famous country music star to get the same benefit.

"Rossdale is disgusted that Gwen is acting like a lovestruck teenager," an insider said. "It's unflattering for a forty-six-year old mother of three."

Since Gwen and Blake became a hot item, it is said that the former couple hardly communicates in person. When they need to talk about the kids, they just send each other email or settle things through the nanny.  The once amicable duo for their three kids, Kingston, 9, Zuma, 6, and Apollo, 1, are reportedly not talking to each other now.

Since Gwen and Blake started dating, Gavin seems to be insecure with a lot of things, the insider claimed. He's thinking his kids will not like it if their mother will be spending more time now with Miranda's ex, given that they just had divorced. It is said that he's also anxious about his career now that his ex-wife is dating a big star like Blake.

Meanwhile, in the midst of Gwen and Blake's dating news, it is said that Miranda is not surprised that the two ended up together. After winning the Female Vocalist of the Year at the 2015 CMA Awards and learning that her ex-husband is now dating his fellow "The Voice" judge, she is said to be focusing more on her career and taking her time before entering into another relationship, E! News reports.

"Miranda is at a point in her life where she is really focusing on herself and her music. This is a new chapter for her to create new relationships and really move on," the source said. "Miranda has been going through many personal changes over the past few months, but it's all for the better."