The two reality stars enjoyed a gathering with some of the show's crew - as well as fellow contestants rugby player Thom Evans and comedian Josie Long.
Marking the end of the intense survival show, the group enjoyed a few glasses of bubbly as they sat down to watch the final episode that aired on Channel 4 last night.
Sharing the photo with her Instagram followers. Lydia wrote: "Celebrating in my personal opinion the best TV show that ever aired on our screens. (Biased I know).
"For the most incredible cause @standup2canceruk I love these more than words could ever describes. My island family. #CelebrityIsland #ProudMoment."
In the photo, the gang can be seen beaming into the camera with an array of island props, including coconuts and plastic palm trees.
Ten celebrities - including Dom Jolly, Aston Merygold and Zoe Salmon - took part in the grueling programme that shows the stars trying to survive on an uninhabited island.
Lydia had her fair share of drama on the show, particularly when she got a fish hook stuck in her finger - ouch!
The Essex girl had been attempting to catch some fish for the island to eat when the hook became caught in her finger and on-island medics had to extract the sharp object to avoid infections.
Marking her bravery, Lydia got a fish hook tattooed over the scar on a holiday in Indonesia after. Discussing the moment, she said: "It was one of the most excruciatingly painful experiences of my whole life,
"I mean, it was horrific. I was left with my proud wound scar. I thought I would highlight and symbolise the amazing experience I had and also the fact I became a very free-spirited woman."