The pretty model, who finished sixth in the reality TV show earlier this year, lent London's O2 Academy Islington a touch of glamour when she arrived at the venue on Friday night (11 April).
CBB winner Jim Davidson and finalist Ollie Locke joined Casey to show their support for the N-Dubz star, after they all bonded within the famous house.
During the evening, Casey took to social media to share pictures of their big night out - which ended with all four enjoying group hugs on stage!
Alongside the pictures, Casey wrote: "My boys :) Ollie, Dappy and Jimbo xxx."
She also tweeted: "Most amazing night, @TheDappy was a bloody superstar!! Me and @ollielocke @JimDOfficial love you loads xxx."
Comedian Jim became like a father figure to Casey within the house, when the glamour model had her feelings hurt by fellow contestant Lee Ryan who declared his love for her but then moved on to Jasmine Waltz (ouch!).
After the show ended, many of the contestants stayed friends, but Lee has struggled with the aftermath.
Although he briefly dated Jasmine on the outside, they recently broke up and he has since been arrested for alleged drink driving.
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Copyright: Channel 5