Actor/musician Darren Criss joined the cast of Glee in November 2010. Originally hired as a guest star, he became a series regular several weeks after his first episode, when the Glee version of Katy Perry's "Teenage Dream" -- featuring Criss on lead vocals, with backup harmonies from collegiate a cappella group the Beelzebubs -- became the show's first single to top the digital charts.
Born in 1987, Criss spent his childhood working as a professional stage actor in San Francisco and playing music with his brother, Chuck Criss, who later joined Freelance Whales. Darren enrol...