Inspired by her two favorite British girls, Ellen and her co-hosts recreated the moment Sophia Grace and Rosie met their idol, Nicki Minaj.
Taking a break from her own show, Ellen decided to take a leap into the world of psychology and familial disputes.
Meet Ellen's evil twin, Sabrina. We still don't know who's the better dancer.
Ellen was Gone With the Wind in this petticoat dress inspired by Vivien Leigh's iconic character.
When in doubt, buy an inflatable costume.
Back before Jennifer Lopez gave birth to her twins, Ellen happy to imitate the pregnant singer, huge bump included.
Remember when the Snooki pouf was all the rage? Well, now you'll never forget.
Ellen for Change—loose change, that is.
Sometimes Oprah Winfrey does share the cover of O.
George would be first to say that Amal is the brains of this operation.
Ellen made the real deal laugh about her wardrobe malfunction at the 2012 Emmys.
Sure, this outfit was for the 2014 Oscars. But as far as memorable costumes go, it's right up there.
Wig firmly in place, Ellen was joined by Heidi Klum, who had the moves as Sia's dance muse Maddie Zeigler.
Ellen rocked these leather pants.
Joined here by Ariana Grande, Ellen introduced the newest member of the Kardashian family with a bold-patterned top and some major cleavage.
NEXT GALLERY: Today Show Hosts' Halloween Costumes Through the Years