Miranda Lambert has expressed annoyance over “incessant gushing” of ex-husband Blake Shelton’s girlfriend, Gwen Stefani, In Touch Weekly magazine reported Thursday. This comes after Lambert reportedly confessed to her friends that she was the reason behind her separation from Shelton.

“Gwen should be worried about what Miranda is going to say, sing and do next,” a source told In Touch Weekly. “Miranda is tired of Gwen incessantly gushing about her new romance with Blake. She’s sick to death of Blake carrying on in interviews about how Gwen ‘saved [his] life’ and saying he was ‘at rock bottom, in the middle of hell’ after their divorce.”

Last month, OK! Magazine reported that Lambert admitted to her friends that she the reason of divorce between her and Shelton was her infidelity.

Lambert has been “wracked with guilt for a while” over her rumored infidelities, and “thinks that alcohol played a part in her behavior,” a source told the magazine. The source also alleged that the songstress “really wants Blake to know she’s sorry” and “doesn’t want to hold him back.” The report, however, was debunked by Gossip Cop.