Britney Spears Whips Andy Cohen Onstage At Concert

Britney Spears brought Andy Cohen onstage during her concert in New York City Tuesday night, but the question is: did she even know who the heck the 'Watch What Happens Live' host was?

Cohen crawled across the stage in bondage at Radio City Music Hall as Spears performed "Freakshow." She pulls someone out of the crowd at every show, but it's an impressive performance on Cohen's part -- he REALLY seemed like a regular.

Also interesting is the fact Brit never said his name. Instead, she went with, “I think you all know who this is … Give it up for him!”