Kady, who finished the second series of Love Island in third place with boyfriend Scott, has been joined by their co-stars at exclusive nightspot JuJu in London's Chelsea ahead of 21st birthday this weekend.
Before venturing out to her bash in an eye-popping dress, Kady posed for a picture with Scott, Terry and Emma-Jane before it was then shared on social media.
Proving just how close they have become since living together in the Love Island villa earlier this summer, Terry Instagrammed: "Birthday celebrations from my lil sister @kadymcdermott much love @scottyspecial @emmajwoodhams."
Meanwhile, Scott has also wished his girlfriend a very happy birthday alongide a picture of himself and his "pocket rocket". Writing on his own account, he said: "The pocket rocket is on [fire] tonight! Happy bday pea head xxx." Aww...kinda!
Along with Scott, Emma and Terry, Kady is set to be joined at her birthday party by some other familiar faces. Fellow Love Island star Tina Stinnes previously tweeted: "So excited to see this cutie @kadymcdermottx for her birthday tomorrow."
Rachel Fenton said: "Tomorrow night at @JuJuKingsRoad is going to be mega! Can't wait to see you all at @kadymcdermottx birthdaaaaay." And Rykard Jenkins joked: "Let's see how wild birthday girl @kadymcdermottx really gets after 2 glasses of wine. See you tomorrow at @JujuChelsea."
Happy birthday, Kady!