Lucy-Jo and her husband Alan Halsall joined a slew of Coronation Street actors at the costume ball hosted by Simon and his wife Emma and held at the Palace Hotel in Manchester on Saturday night (15 June).
The day before, Lucy-Jo had tweeted: "Can't wait for @simongregson123 and @emmagleave's "American 50's Diner" Charity Ball @Palacemcr tomorrow night, what will my bump wear? Ha X."
We reckon she and her bump got it spot on with casual 50s style.
Lucy, who wore a pair of comfy leopard print pumps rather than sky high heels, was snapped leaving the ball with close friend Carolynne Poole, who shot to fame on X Factor.
Simon and his wife Emma, who dressed as Danny and Sandy from Grease, organised the ball to raise money for the disability-led theatre company Proud & Loud Arts and the charity Scotty's Little Soldiers, which supports children who have had a parent killed in action while serving with the British Armed Forces.
Simon tweeted afterwards: "Thank you to everyone for last night and your support wow I'm still in shock at how amazing it was we raised loads THANKYOU. I can't thank everyone individually as the response is amazing so THANKYOU all."
Emma added: "Loved last night!!!! Thank you everyone for making it special."
Watch our recent video chat with Lucy-Jo below: