"The Voice" co-judges Blake Shelton and Gwen Stefani are allegedly flirting with each other "openly" and Miranda Lambert is allegedly angry about the affair.

Hollywood Life noted that on the Sept. 29 episode of "The Voice," Gwen Stefani and Blake Shelton were openly flirting with each other when they fought over Cole Criske.

At one point, Gavin Rossdale's ex even threw a stiletto at Miranda Lambert's former husband.

But a source told the site that Blake Shelton is not ready to jump at another relationship after the divorce with Miranda Lambert.

"Blake can't help himself, he's a natural flirt and Gwen is adorable," the insider said."Part of him hopes that seeing him looking so fit and working so close with a knock out like Gwen makes Miranda jealous."

If that's the case, then it seems to be working.

According to the rumor mill, Miranda Lambert is not at all happy with the rumors that Blake Shelton and Gwen Stefani are hooking up.

According to Life& Style magazine, Miranda Lambert was "really upset" upon hearing about the rumors on Blake Shelton dating Gwen Stefani, his fellow judge on "The Voice."

"Before Blake hooked up with Gwen, Miranda and Gwen were friendly," the source alleged. "But her new relationship with Blake will definitely ruin any chance of them ever being close again."

In July, Blake Shelton and Miranda Lambert announced that they are divorcing by issuing a statement which read, "This is not the future we envisioned. And it is with heavy hearts that we move forward separately. We are real people, with real lives, with real families, friends and colleagues. Therefore, we kindly ask for privacy and compassion concerning this very personal matter."

Speaking at the Bobby Bones Show, Blake Shelton said that he's still friends with Miranda Lambert after the divorce.

"Our whole thing was: You know, we're just going to be cool about this. It is what it is," he said.