Today on Twitter, Lea Michele was full of glee -- literally. The 'Glee' star tweeted that she was off to rehearsals for the Emmys, where she and the rest of the cast will make a surprise appearance. Elsewhere, B.o.B. talked about life on other planets, Miranda Cosgrove pimped all all-new 'iCarly' with her tweets, and Vanilla Ice sipped on a Starbuck's drink named after him. Meanwhile, poor Rihanna's tweets made it seem like she's a bit blue over her love life, and we can't help but wonder what's going on there! See what your favorite stars were tweeting about today.