Theo - who appeared on the 2017 series of the dating show - was partying at O Beach in Ibiza just two days ago.
Kaz took to her Instagram Stories earlier today (27.08.19) to reveal Theo was out of surgery. She shared a picture of the pair smooching, and wrote: "Got him back out of surgery. What are you like babe (sic)"
Several of Theo's former Love Island stars sent him messages of support, including Georgia Harrison, who wrote: "Love you more than anything in the world. Nothing will hold you back I promise xxxxxxxx. (sic)"
Marcel Somerville shared: "Ah bro sorry to hear this news, everything will be bless g, mad things happen in life but we roll with the punches. Mans jus got a new niche fashion accessory to rock. (sic)"
Meanwhile, Campbell has taken to social media again to praise medics for saving his eye after they initially thought he may lose the visual organ, which "split in half" when he was struck by the bottle stopper.
He wrote on Twitter: "I currently have 7 stitches in my eye (gross) and the doctors say it's unlikely I'll see properly again, they done a good job saving it as they said I might loose my whole eye to begin with. But Im hopeful and don't want to believe my eye is gone forever. Anything is possible (sic)"