ellen-degeneres-nicki-minaj.jpgMichael Rozman/Warner Brothers

We love it when celebs dress up as other celebs on Halloween!

Ellen DeGeneres grabbed a wig and some fake cleavage and threw together a hilarious costume for her show on Wednesday. "This year I decided to go as something really scary – half naked," she joked. "Of course I’m Nicki Minaj. Nicki was on the show a few weeks ago. Her shirt was not. She took my show from a PG rating to a Double D." HA!

Of course, Ellen wasn't the only one who wore a prosthetic chest ... check out Matt Lauer as former Baywatch babe Pamela Anderson:

matt-lauer-baywaych-halloween.jpg

Is it just us, or does Matt really love to dress in drag? Check out more Halloween pics in the gallery below!