Cowboys quarterback Tony Romo and pop star Jessica Simpson are "so in love" with one another, according to a source close to the couple. The couple had a romantic Valentine's Day celebration planned in order to celebrate their love. Simpson dedicated a song to Romo on Thursday while performing at Madison Square Garden in New York. "There is something about being in love, right?" Simpson told audience members while performing "You're My Sunday" in honor of Romo. "It just makes you appreciate every day, right? ... That's kinda how I feel right now."