The Foo Fighters star previously appeared in 2011 movie The Muppets as a character called Animool in spoof band The Moopets. He was only seen for around five seconds, dressed in his own version of Animal's jumpsuit, collar and chain.

Asked who was the hottest Muppet, Grohl said at the time: "I think everybody had Miss Piggy fantasies - she seemed sassy. I always had a thing for Grover, to be hones, and his alter-ego, Super Grover. I had a Super Grover doll growing up." He added: "I've never wanted to f*** a Muppet, if that's what you're asking…" Read more - here.

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