Gwen Stefani and Blake Shelton are all over the news with their public displays of affection. Despite the mushiness, one person remains unconvinced. Miranda Lambert believes that the two are just putting on a show.

In light of the holiday season, Stefani and Shelton sent out cutesy Christmas cards to their closest friends. As a personal touch, the couple filled the cards with some of their silly snaps together. Lambert reportedly learned of the mushy greeting card and thought that the gesture was "too much" it is beginning to look like a "publicity stunt."

An insider told Hollywood Life, "Miranda caught wind of the card and is just embarrassed for them. It's just too much and too fast. She thinks it's just a publicity stunt."

The insider also added, "Miranda feels like if they were confident about their relationship, then they wouldn't feel the need to flaunt it so much!"

In previous reports, sources have said that Lambert feels that Shelton is behaving completely out of character. She should know since they were married for over a decade. It is finally clear now to Lambert why her ex-husband has changed. It turns out, he and his new girlfriend have an ulterior motive.

Regardless of what Lambert thinks, Stefani and Shelton are not holding back. The two once again made the headlines when Stefani came rushing to embrace the country singer after finishing a performance of "Rhinestone Cowboy" on a recent episode of "The Voice." Last December 14, Stefani is noticeably love-struck while watching her beau. Perhaps she couldn't hold it in anymore that the moment he got off stage, she immediately gave him a huge hug.

As a matter of fact, the couple almost made a slip. An eye witness during that night related, "He almost kissed her on the lips and she pulled away basically knowing all eyes were on them. She then turned to the audience and he walked back to his chair."

Is Lambert simply bitter or are Shelton and Stefani faking it? What do you think?