Television shows provide numerous outlets for some perfectly unexpected celebrity cameos.
Whether stars are playing themselves, like Kris Jenner on "The Mindy Project," or are showing their acting chops, like Britney Spears on "How I Met Your Mother," it's always a joy to recognize a celebrity on your favorite show.
Here are 21 unexpected guest appearances made by celebrities on TV.
Britney Spears has had a number of fun cameos throughout the years, including on "How I Met Your Mother."
Spears played a receptionist who fell in love with Ted and ended up briefly engaged to Barney during a two-episode stint on the third season.
Some other shows she has made cameos on include "Sabrina the Teenage Witch,""Glee," and "Jane the Virgin."
Kesha popped up on "Jane the Virgin."
The musician played Jane's rude neighbor who kept blasting her music and having band practice late at night, messing with baby Mateo's sleep schedule.
Pete Wentz, from Fall Out Boy, made an appearance on "One Tree Hill" with the band and solo.
Fall Out Boy performed twice on the show, but Wentz formed a connection with Peyton and joined the girls on a weekend trip to the woods. They started a relationship, but it ended when Peyton used a plane ticket he bought her to visit an ex.
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