TV highlights: New reality series follows the lives of the 'Wives and Girlfriends of Sports Stars.'

Twelve acts in "America's Got Talent" (NBC at 8 p.m.) perform at New York City's Radio City Music Hall.SERIES PREMIERE: Benny and Rafi Fine host "Six Degrees of Everything" (truTV at 9:30), a new comedy reality show in which they draw connections between two seemingly unrelated topics. First up: Albert Einstein and breast implants.