"National treasure" Jack Black left Kelly Clarkson's viewers in tears after he dropped by the show to surprise his number one fan, Love on the Spectrum'sTanner Smith. In a video of the "wholesome ...

Thursday's (April 3) show also featured "A Minecraft Movie" star Jack Black making a "Love on the Spectrum" star's dreams come true. By Gil Kaufman Rock, pop, country? You name it, Kelly Clarkson ...