Jessica Simpson is not the best singer in Tony Romo's ears. Reports say the footballer had compared his current girlfriend's singing ability to his ex Carrie Underwood's, and he even told her to her face what he thinks.

"[Tony] really hurt Jess' feelings," a source tells OK! magazine. "She tried to laugh it off in Hawaii, but she pouted whenever she heard Carrie's songs playing."

Not only that, Romo apparently isn't very supportive of Simpson's move to switch from pop to country. He thinks that she would have trouble gaining audience.

"Tony said he thought Jess would have trouble winning over audiences with her upcoming country CD," the source adds.

And it's not only her beau that has doubts about Simpson's country venture. Rascal Flatts lead Gary LeVox also doesn't think highly of the move.

"It is tough to be a pop artist and them make country records. Country fans get it. They go, 'You're not country - you're a pop artist.' The fans make you or break you."

Romo remains friends with Underwood, who was an American Idol champion and a country singer, despite breaking up in 2007.

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