Simply irresistible! Popstar Jessica Simpson is calling her boyfriend Tony Romo "the perfect guy," says People magazine.

"I just told him today, 'You're the love of my life,' " she tells the mag in its latest cover story. "I don't really ever say that to anybody."

The 28-year-old singer reveals she co-wrote a song about her NFL star beau called "You're My Sunday."

Jessica also says she's changed her phone number and e-mail address to avoid contact with any of her former loves -- and it doesn't bother her that Tony hasn't yet changed his contact numbers because she says she is "not a jealous girlfriend." Tony's ex Carrie Underwood recently made headlines, claiming Tony still contacts her.

"I don't want anybody that's been in my life [before] in my life anymore," Jessica says. "I don't even want them to have any way of contacting me."

Jessica also adds that she got through her break-up with John Mayer by doing some work on herself. "I had to regain self-esteem and self-value," she says.