Simpson shines on stage at the California State Fair in Sacramento. Plus: Brad Pitt, Beyoncé and Solange Knowles, Pete Wentz and more


Meanwhile, sister Solange Knowles positively sparkles while arriving Monday at The Late Show With David Letterman, where the singer performed the song "Sandcastle Disco" from her new album, Sol-Angel & the Hadley St. Dreams, out in stores on Tuesday.