...wearing a hoodie featuring mugshots of several celebrities?
Hint: He wrote a song that Britney Spears made a music video for (which includes scenes of a wedding reception, featuring K-Fed).
It's....Bobby Brown! Whitney Houston's ex-husband and R&B artist from the 1980s.
(I'm the one pictured on the right, in case you weren't sure)
Bobby was wandering around the convention and watched the hair show that I was in.
He also took a few shots of vodka, from a friend of mine, moments before this picture was taken.
Source = me
Actual mugshots of Bobby Brown are here.