The pair managed to avoid being snapped on the pink carpet together but it would have been hard for Mark to miss Lauren inside the event in her figure-hugging purple dress which showed off her new slimline figure.
Lauren ditched her usual OTT makeup and mahogany fake tan for a more natural look (by her standards at least) for the bash at Cadogan Hall.
Now she's left TOWIE, could this be a sign of things to come? We hope so, because we're loving the more toned-down look.
And Mark was rather finely turned out too in a very dapper three-piece, navy suit.
Lauren - who is rumoured to be taking part in this year's Dancing On Ice after leaving The Only Way Is Essex - was back in the gym this morning.
She tweeted: "Morning everyone I'm on way to the gym eating blackberries #IamAddictedToFruit".
And she also teased that she'll be back on our screens soon after confirming she's left the reality drama.
"Hey thanks for lovely tweets! Good luck towie tonight still love the show..yes its true I have left but will be seeing you soon! Love LG x"