Today on Twitter, Jeremih and Big Sean tweeted their praises for the new Jay-Z and Kanye West song, 'Otis,' off their upcoming album 'Watch the Throne.' Matt Nathanson is suffering through a heat wave and Grace Potter posted a picture of Jay Leno's ride to the Tonight Show. Jordin Sparks got her daily dose of cute and Lee DeWyze took a trip back to grammar school with his lunch. Oh, and Bruno Mars had a dose of something that made us lose our lunch. See what your favorite stars were chirping about today!