Following your favorite stars on Twitter is always a treat. This week in the tweet world, we got a glimpse into Mariah Carey's love life with her husband, new father of twins Nick Cannon. Well, sort of -- Carey goofed off with a poster of her hubby by pretending to kiss his shrunken-down image. Also online, Selena Gomez tweeted a Twitpic of her and some girlfriends enjoying (non-alcoholic) Harry Potter butter beer in Orlando, Jessie J showed off her new purple locks and Kelly Rowland celebrated her album release with a delicious meal. See Twitpics of how popstars spent their week!