It must be tough to bring dates home when Dad is a rock icon. Mick Jagger's daughter ELIZABETH JAGGER, a model, found a harmonious solution--date a guy who understands the gig. "They are so in love," Elizabeth's mom Jerry Hall told the British press of Elizabeth and her new beau, SEAN LENNON. "We had all these incredible family sing-songs with him around the piano." Lennon's rep declined to comment, and Elizabeth's says the pair are "friends." Here's hoping they progress to procreating--their children could frolic with Coldplay's tykes.