Katie, 31, was pictured outside party restaurant Steam & Rye in the east of the capital and was all smiles following her night on the tiles.
The inspirational star - who is mum to 11-month-old daughter Belle - was wearing a simple long-sleeved jersey in grey, which she teamed with grey checked trousers and coordinating sandals.
Katie then added a pale pink clutch bag to her ensemble and was rocking a half-up and half-down hairdo.
Not quite 50 Shades Of Grey, but almost!
While at the bash, Katie rubbed shoulders with the likes of TOWIE's Jasmin Walia, CBB star Casey Batchelor and Geordie Shore's Vicky Pattison, who were also out to let their hair down!
Katie posed for a picture with Casey, who then posted it on Twitter for fans to see. Alongside it, she tweeted: "Lovely to see you hun @KatiePiper_ funny catch up! Lunch soon xx."
It was back to work for Katie today, and it seemed she needed a little caffeine hit to get her through. She joked with fans: "Using my daughter's flask for my coffee in taxi on way to work! #sorryB." Oops!
Katie Piper: All you need to know!