Papa Joe may not be the only third party coming between Jessica Simpson’s happily ever after with boyfriend Tony Romo. Jessica is feeling threatened by Tony’s continuing friendship with Carrie Underwood and has demanded that the Dallas Cowboys QB put an end to his friendship with his American Idol-winning ex.

“Tony and Carrie still talk. She [Jessica] is really upset that he’s still communicating with Carrie,” one In Touch snitch says. “She had specifically asked Tony to stop.”

Jess has been left particularly insecure about a possible Romo/Underwood reunion now that the “Jesus Take The Wheel” singer is back on the market:

“Things got worse for Jessica once Carrie was on the market again after breaking things off with Chace Crawford.”

And while it’s unsettling for most women to know that their boyfriend is still in contact with his ex, friends say Jessica’s insecurity could prove toxic:

“Jessica has to tone down how jealous she gets over things like this. It took a toll on their relationship.”