Casey shared a picture of herself enjoying a soak in the tub with the giant gold toy, admitting she may have accidentally sneaked it into her bag as a souvenir...
The glamour model tweeted: "Look who came home with meeeeeee! ;) hehe! x."
The large rubber ducks were iconic during the most recent series of CBB, especially after Dappy snogged one during a game of Truth Or Dare with Luisa Zissman and Jasmine Waltz.
Given the big risk that this could be the exact one, we hope Casey gave it a good scrub before plopping it in her bubble bath!
Casey has been having a great time now she is back in the real world, however her duck theft and recent night out has hinted that she is missing everyone.
Earlier this week, Casey met up with fellow CBB housemate Ollie Locke for dinner.
The pair were joined by Ollie's best friend and former Made In Chelsea co-star Cheska Hull and had a blast reminiscing about their time on the C5 show.
The CBB 2014 lineup - and results:
Copyright: Channel 5