She's already an actress, a model, and a "clothing designer," but will Sienna Miller soon have a pop album out? That's the rumor from London, where Sienna's sort-of-boyfriend Rhys Ifans (yes, the total goofball from Notting Hill) has threatened to unleash a duet on the world between the two movie darlings. The speculation comes on the heels of another big duet among two too-cool people: Irina Lazareanu and Sean Lennon, who performed together during last week's Chanel show in London. Meanwhile, Heidi Klum and Seal famously sang together on the Victoria's Secret runway last month (or last week, if your first view of the show was on TV). We're sure Sienna would release a lovely little single, sort of like Gwyneth Paltrow's radio hit "Cruisin'" to promote her awful movie Duets - But we hope Sienna takes a cue from Madonna and hires Mario Testino to shoot her album cover. Then there will really be something to talk about.