Today on Twitter, the pop stars were feeling a little frisky and full of jokes. Early in the day, while looking at old promo pics of himself, Gavin DeGraw made an awkward comparison between the embarrassing photos and floating male genitals in a bathtub. Old Kid Jordan Knight must have caught the funny bug, too, because he made light of child factory workers (LOL?), while 'The Voice' runner-up Dia Frampton tweeted a funny exchange she heard in the grocery store. Jennette McCurdy's tweets always have us laughing, and her Friday collection was no exception -- and like every week, Katy Perry made the old 'T.G.I.F.' joke. See what your favorite stars were tweeting about today!