Tony Romo may have been Jessica's date for sister Ashlee's wedding, but there's no doubt who really has this girl's heart.

Daddy.

"It's always been daddy," says a source close to the eldest Simpson girl. "That was the problem in her first marriage, putting Nick second. And it's been a problem for Tony."

Following the weekend nuptials, Jessica headed to Cabo San Lucas with her father, Joe Simpson, and mom, Tina. And while Tony was invited to go, he opted to skip it.

Not only that, the two haven't spoken since the wedding, according to a Tony pal.

"I almost think it's not so much that he's tired of Jessica's attention," said the source. "He's tired of Joe. He's always giving Tony career advice. Even advice on how to date his daughter, like where to take Jessica out. Tony hates it."

Like a good daddy's girl, Jessica defends her father's motives—which really irritates Tony.

"He wants to date Jessica, not her dad," says the friend, adding, "Tony took her to the wedding to be a nice guy. But at this point, he just wants to back out gracefully."