Bride Hayley Rosenblum and her groom Blonie Dudney were enjoying their wedding reception at the Four Seasons hotel in St. Louis on Saturday night when non-other than Katy Perry and her entire dance troupe stopped in to see what was going on. Needless to say, the bride and groom were shocked to see a world-famous pop star show up unannounced at the reception but had a great time hobnobbing and sharing a dance with Perry. Perry was in St. Louis for a concert and staying at the same Four Seasons hotel. “We were just looking for an after party,” said Perry. In addition to this video, TMZ posted some great photos here.