Rhys Ifans and Sienna Miller have finally sealed their relationship with a kiss - after they were caught sharing a smooch by British paparazzi. The pair have previously denied speculation they are dating, insisting they are just good friends. But the stars were photographed in a romantic clinch in a West London street on Saturday (13Oct07). A source tells British newspaper The Sun, "There's no way they are just mates. They looked like a couple very much in love. "They were holding hands as they walked the dogs and then stopped to share a lingering kiss. Sienna couldn't stop smiling."