A mustachioed Katy Perry helps celebrate Ellen DeGeneres' 55th birthday during tomorrow's episode of The Ellen DeGeneres Show.
RELATED: Candid Star Sightings
The comedienne's birthday is Saturday, but instead of receiving gifts she decided to dish them out, allowing Perry to live her dream of being a game show host.
In the clip, Perry enters in '70s TV garb complete with a plaid three-quarter-length suit jacket, bow tie and mustache.
RELATED: Ellen DeGeneres Slams One Million Moms
"I asked for the Anne Hathaway, obviously," Perry joked, referencing her cropped hairdo.
Click the video to see the pop star introduce "everyone's favorite party game" Grab Ellen's Bust. You can watch the entire birthday episode on Friday. Check your local listings.