Today on Twitter, J. Lo tweeted a picture of she and her mother meeting Will and Kate at the inaugural BAFTA Brits to Watch 2011 gala in Los Angeles. Nick Cannon marveled at the beauty of his wife Mariah Carey, and Joel Madden tweeted that he had a special guest in the studio. We bet you'll never guess who it was! Toni Braxton had some well wishes for Lil Kim, while Jay Sean warned fans about a fake concert. See what your favorite pop stars were chirping about today!