The Marquee
I think he was the only current pop star type person I saw at the XFM Christmas Party (10th December), but that could be all the free whiskey playing tricks.
Celebrity spotting, not really stalking. Got to catch them all! Originally a popular feature of my site popex.com, so mostly from the early noughties. 99% written by valued punters. Hopefully now with some bonus location content that was lost for a while.