Is Sienna Miller still dating Jamie Burke, the face of Calvin Klein? Those watching will probably know by Saturday, when Jamie's band, Bloody Social, plays in Southampton. Their last concert at Stereo drew a crowd that included Lindsay Lohan and Kate Bosworth, and this one - at the Hyt Me Estate - could be just as exciting for Us Weekly, Perez Hilton, and many others who would never admit in public that they like Jamie's music - or that they like looking at famous people. If Jamie behaves himself around all the girls at his gig, we can assume his heart is safely locked away in England. If he gives another secret concert in his basement, however, we bet his relationship will soon dissolve so he can concentrate more on modeling. Or something like that.