Thanks to Twitter and 2011 technology, we're able to live vicariously through our favorite music stars. This week, folks like Jennifer Lopez, Kesha, Katy Perry and more shared TwitPics of themselves hobnobbing with other stars and just goofing off in general. Lucky 'American Idol' and radio show host Ryan Seacrest met up with pop icons Joe Jonas, Selena Gomez, and Demi Lovato this week, while 13-year-old Greyson Chance blended in at the Harry Potter and the Deathly Hallows premiere. Check out our TwitPics of the week to see what the stars were up to this week!