Lucy dressed as Christina in the Lady Marmalade music video for her party.
In the pictures, shared to her Instagram page, she's wearing a red corset, black hotpants with a fringe, fishnet stockings, red boots and a blonde wig.
She captioned the first post: "Hey sistas, soul sistas, betta get that dough sistas. Love ya @xtina xxxxx.
"Thank you @taheedkstylist and @asos for finding me all this amazing stuff! And @hairarvina and @callumorlandohair for making this amazing wig. XTINA wouldn't be the same without you at all xxxxx."
Her Corrie co-stars rushed to comment on the post.
Alexandra Mardell, who plays Emma Brooker wrote: "Yaaaaaasssss gurl."
Faye Windass actress commented: "FIT."Tina O'Brien, who plays her on-screen mum Sarah Platt, said: "Oh God I thought I couldn't adore you any more. Happy birthday you wonderful human."
Lucy appeared to have a good time sharing photos with her family and friends from the celebrations.
Whilst Lucy was dressed as Christina for the night, fans are more used to seeing her play Bethany in the ITV soap.
Despite announcing her exit, Lucy confirmed one day she would return to the popular soap.
She told Mirror Online: "I will be sad but I'm excited to see what's going to happen in the future, although I have no idea what's going to happen.
"When I leave I'll have been there for five years and I've never done anything else, so I just want to try new things and do new things. But I'll end up going back - I'll be back."
During her time playing Bethany, Lucy has had some tough storylines.
After being cruelly bullied at school by a girl named Lauren and her friends, Bethany was groomed by Nathan Curtis.
Currently Bethany isn't well loved by Weatherfield residents.
After Daniel Osbourne kissed Bethany after a fight with his dying wife Sinead, residents soon heard what happened and began blaming Bethany.
Coronation Street airs on Mondays, Wednesdays and Fridays at 7.30pm and 8.30pm on ITV.
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