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OTRC: Katy Perry's guest spot on 'The Simpsons': What did you think of it?

Katy Perry had a live-action guest role on 'The Simpsons' in December 2010. (Fox)

Katy Perry recently guest starred on a special "live-action" Christmas episode of FOX's hit animated "The Simpsons", which featured the characters as puppets.

The episode was watched by 9.6 million people and earned a 4.2 preliminary rating among adults aged 18 to 49 rating.

The pop star's appearance followed a controversial video of her singing to "Sesame Street" muppet Elmo, which never aired on television following complaints about her cleavage-bearing outfit.

Perry, who grew up in a strict Christian household, has said she is a "secret" fan of "The Simpsons". Her episode aired on Sunday, the same night as her "VH1 Divas Salute the Troops" special (Check out photos from the event).

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