. "Celebrities including First Lady Michelle Obama, Elton John, Robin Williams, Justin Bieber, Katy Perry, Keith Urban, Mariah Carey, Glenn Close, Tyler Perry, Mary J Blige, Carrie Underwood, David Duchovny, Kobe Bryant, Magic Johnson, Usher, KISS, Rihanna, Jessica Alba and Derek Jeter are among the many who got on the bus\" over the years to join the show." . . . . . . . . . . . . . . . .