Today on Twitter, pop stars with shows booked on the east coast this weekend sent tweets filled with disappointment over Hurricane Irene, which is headed straight for New York City. While Katy Perry prepared her sea legs and swabbed the decks, 'Unfriend You' hitmaker Greyson Chance tweeted that he's super bummed about Arthur Ashe Kids' Day being canceled. Sadly, Allstar Weekend tweeted to call off their NY show, as did Victoria Justice for a signing she had scheduled, and Kevin Jonas shared that he's just soaking it all in. See what your favorite stars were tweeting about today!