Surprise Happy by Pharrell Flash Mob Dance Routine

Guests were surprised when the mother-son dance turned into a a flashmob choreographed by the groom and his mother. "They started out waltzing to Edelweiss, but then the music switched into Happy by Pharrell," says Elizabeth. After the first verse, Chris' stepfather and I joined them along with our wedding party and families—by the end of the song, even some of our guests had picked up the moves and joined in!"