Appearing on Oxygen's reality series Celebrities Undercover on March 18, Kim Kardashian wore bad fake teeth, a frizzy wig, and glasses to trick fans interviewing to be her assistant. Credit: Oxygen

Ugly Betty spinoff? Kim Kardashian looked unrecognizable on the Tuesday, March 18 episode of Wendy Williams' Oxygen series, Celebrities Undercover. The Keeping Up with the Kardashians star wore a dramatic disguise to trick fans who were interviewing to be her assistant. See more photos of Kim here.

Kardashian, 33, wore prosthetic makeup to transform her face on the show. The reality star also wore a curly, frizzy black wig, thick-framed glasses, and bad fake teeth to further hide her identity.

The end result? Kardashian's alter-ego Cynthia, who looks remarkably like America Ferrera's character Betty on the 2006 series Ugly Betty.

And the disguise worked! Kardashian, as Cynthia, pretended to join other fans in interviewing for the position of her assistant, without any of the girls realizing it was her -- including her own sister! Kourtney Kardashian didn't recognize Kim until she pulled of the wig and prosthetic makeup for the big reveal.

Celebrities Undercover airs Tuesday nights at 10:30 p.m. on Oxygen. Tell Us: How do you think Kim Kardashian looked in her disguise?