According to some new reports, Gwen Stefani isn't necessarily as secure in her relationship with Blake Shelton as she may seem.

In fact, according to the latest round of rumors, Stefani was peeved when Shelton reportedly met up with ex-wife Miranda Lambert secretly recently to clear the air, and has now warned Lambert that she needs to back off and steer clear of Shelton.

According to OK! Magazine (via Hollywood Gossip), Shelton and Lambert mey up backstage during the recent ACM Honors, and witnesses claimed the two had no bad blood between them, but when Stefani learned of the "reunion" she blew up.

"Blake thought [Stefani would] be happy they'd gotten the chance to call some things water under the bridge," a source said. "Instead, though, it sent her into a panic."

Stefani's alleged panic then led to her texting Lambert and warning her to "stay away from her man," and Lambert didn't take the threats lightly, so the two are now locked in an alleged heated feud that has those close to them worried about the possibility of the two coming face-to-face any time soon.

"Gwen went on a rampage, and Miranda didn't hold back either," the source claimed. "God help them all if they come face-to-face anytime soon."

It is unclear of course if such a showdown ever did take place, or if the two women are even engaged in any type of feud, as there hasn't been too much bad blood between Lambert and Shelton at all since they divorced last summer.

Both he and Lambert moved on fairly quickly afterwards as well, with Shelton and Stefani going public with their romance in November, and Lambert going public with her own romance with musician Anderson East around New Year's.

In addition, there has been endless gossip lately which has suggested that Shelton and Stefani are even planning a Christmas wedding at his Oklahoma ranch, a report that hasn't been denied or confirmed.

Tags: Gwen Stefani Blake Shelton Miranda Lambert