Tony Romo and Jessica Simpson
02/15/2009 AT 10:30 AM EST
was feeling the love on Valentine's Day – throwing out more than one "I love you" to NFL-player boyfriend Tony Romo during her Saturday night performance in Rochester, N.Y.
"I'm celebrating the life I'm living right now," the singer, flaunting muscular bare legs in a sexy black minidress, told the nearly full auditorium.
Introducing "You're My Sunday," a song she co-wrote for Romo, Simpson, 28, announced, "Somebody came into my life and made me see myself in the best mirror possible, so I wrote this song for her."
Simpson immediately caught her slip. "Ha! Can you imagine?" she said before then joking that she had penned the number for her dog, Daisy.
Looking toward Romo, she said, "Sorry, baby. This song's for you."
Before ending her set with "Do You Know," which she recorded with Dolly Parton, Simpson told the audience she wouldn't be onstage without the country legend's longtime support. Last week, Parton defended Simpson's curvy shape on Larry King Live
"Do You Know" drew her right back to talking about her beau. "This song makes me want to suck face. I love kissing," said Simpson, "with the right lips, of course."