Ever been watching your favorite show, just enjoying yourself, when suddenly -- BAM! -- a surprise appearance by some celebrity?

I remember being shocked when high-profile actress Charlize Theron appeared in Arrested Development as a mentally unstable love interest; it seemed such an unexpected yet endearing role for someone of her caliber.

Here are six instances you forgot Mix artists made surprise cameos in television shows:

1. Britney Spears

Britney has made a number of tv appearances over the years, including Sabrina the Teenage Witch, Glee, Jane the Virgin, and several as Abby the Receptionist on How I Met Your Mother.

2. Kesha

Kesha plays a rude musician-neighbor in Jane the Virgin.

3. Pete Wentz (of Fall Out Boy)

Pete Wentz made a couple appearances on One Tree Hill.

4. Adele

Adele made a brief albeit entertaining cameo in Ugly Betty.

5. Demi Lovato

Demi Lovato made an appearance on Grey's Anatomy as a young girl misdiagnosed as paranoid schizophrenic.

6. Ed Sheeran

Redhead Ed made an appearance in Game of Thrones as a Lannister soldier who -- naturally -- sings. His cameo left a lot of fans surprised and unimpressed.

And just for good measure, let's not forget the time Minnesota's very own Prince made a surprise appearance on Zooey Deschanel's New Girl, offering Jess and Nick love advice.

Did I forget a time a Mix artist appeared in a TV show? Leave a comment in the comment section!