Rob Riggle is joining The Masked Singer for the season 5 quarterfinals. The comedian and star sits down on the panel on Wednesday's big episode, and reunites with his former star, Ken Jeong.In ET's exclusive clip from the episode, Jeong is surprised by host Nick Cannon with a piece of fan mail sent in by an audience member.«Dear Ken, I am the world's biggest fan,» Jeong reads aloud from the fan letter. «I understand your co-star Rob Riggle is on the show tonight, and he stole the movie.»«You were the best part,» fellow panelist Robin Thicke tells Riggle as an annoyed Jeong looks on, irritated.«Can you get him to sign this?» Ken continues reading, as Riggle is more than happy to hop up and autograph the letter.
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