Jessica, 27, will be maid of honor at her 23-year-old sister's wedding to rocker Pete Wentz. A source close to Jessica tells PEOPLE that Romo will be attending the event with Jessica.
Getting a head start, on Friday Jessica and Romo met for lunch at Katsuya in Hollywood. The Dallas Cowboys quarterback, dressed casually in shorts and sneakers, arrived at the restaurant in a cab for the lunch with Simpson, who wore a sexy black short-shorts and high heels. He greeted the singer with a kiss and helped her out of her Range Rover.
The lunch date comes as Simpson's rep denies newspaper and Internet reports that Romo and Simpson have broken up. "It's not true," rep Cindi Berger tells PEOPLE.