Lambert joins a growing cast that includes Victoria Justice and Ryan McCartan as sweethearts Janet Weiss and Brad Majors along with "Orange is the New Black" actress Laverne Cox who was cast as mad scientist Dr. Frank-N-Furter.
"I grew up watching 'Rocky Horror,' but could never imagine that I would be part of this new vision," Lambert said in a statement.
"'Rocky Horror' always made me feel like it was OK to celebrate my weirdness. Hallelujah, bless my soul! I love that old-time rock-n-roll!"
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