Blake Lively and Ed Westwick were joined on set by newcomer Kevin Zegers in NYC yesterday. They were hard at work filming the show's third season, and last night's WTF moment-filled episode featured the controversial threesome that has some advocacy groups rather mad. Although our prediction about which three stars would be involved didn't end up being true, there was some romantic tension between Serena and her boss as well as more than enough drama amid all the fashion, beauty and tech on display.

To see more of Ed and Blake on set, just