The TV presenter, 27, embraced the fancy dress theme of 'chavs' and showed his sense of humour in his choice of outfit - as did his pal, Big Reunion star Kenzie who was DJing at the Manchester event.
In teeny tennis shorts and chunky gold chain, Mark was in danger of breaking decency laws!
Michelle seemed to be using Sandy from Grease as the inspiration for her outfit - wet-look skin-tight trousers, crop top, cheap costume jewellery and backcombed hair.
Dozens of Michelle's Corrie cast mates also turned up to help the actress, 26, celebrate closing a chapter in her life and beginning a new one.
Jack P Shepherd looked scarily thuggish in tracksuit bottoms, football shirt and chains, while Lucy-Jo Hudson and Alan Halsall nailed the theme and threw any self-respect to the wind!
Posting a selfie on Twitter, dad-of-one Alan joked: "Me & @LucyJo_Hudson tonight for @michkeegan leaving do #wearesupposedtobegrownupparentsnow."
One of our favourite outfits has to be Sacha Parkinson's though. The actress left her usually glamorous self behind, when she dressed as possibly the most famous chav on TV - Shameless character Frank Gallagher!
Brooke Vincent donned a burberry skirt and PVC cap as she attended her close friend's farewell shindig, but somehow still managed to look cute as a button.
Before she left home, she tweeted: "Going out tonight dressed as a chav.... Same outfit I wore at 14 and thought I was mega cool."
Meanwhile, Kym Marsh choose NOT to dress up, but oozed glamour in a super-tight LBD.
Michelle filmed her last scenes on Corrie last Thursday, and posted an emotional message to her fans.
She wrote: "Thank U for all the support over the last 6 n a half yrs. I'll always have a piece of Tina with me - It's inevitable I have her earrings! X"
Whose fancy dress outfit do you prefer? Tell us below!