The former Towie star was branded "despicable" as she left behind the cheating drama for a party in Italy's fashion capital.
Posing in front of some fairylights, 27-year-old Lucy is forcing a smile as she shows off her trendy outfit.
The former reality star is dressed in a sequinned, black bodice with a sheer neckline and dark trousers.
Lucy completed the look with an embellished, black clutch bag and classy chandelier earrings.
She simply captioned the post: "Milano.
But fans were more focused on the latest headlines than what Lucy was wearing, with one cruel troll commenting: "Is that what you wore when you cheated on your BF? Despicable."
Another added: "Even if she didn’t cheat, still unacceptable how touchy feely she was in the vid, I’d be fuming as well."
Meanwhile, a third quipped: "Waiting to see if Ryan likes this post."
Earlier today, Lucy came under fire when she posted another image from the evening – this time alongside fashion designer Elisabetta Franchi and model Hofit Golan.
She captioned that snap: "Happy 20 year anniversary! What an unbelievable party by a truly incredible designer. Thank you."
In the comments, fans urged Coronation Street actor Ryan to dump the ex-Towie star.
One wrote: "Dump her @ryanthomas84 she's made a proper fool of you #snake".
Another critic added: "She was rubbing herself all over him, kissing his neck vile woman.. I hope @ryanthomas84 is no mug!!!"
Ryan is yet to like either of the posts.
Lucy hit the headlines earlier this week after she was caught on camera cosying up to an unidentified man in a Dubai nightclub.
Lucy was spotted partying with a group of friends at The Penthouse, Five Palm, earlier this month, before she was caught kissing a man on the cheek, holding his hand, and rubbing his back.
Sources previously told the MailOnline that Lucy had been "rubbing the inside of his leg" and that the two "left two minutes apart".
The footage left Ryan, 34, devastated.
Earlier today, The Sun Online revealed that the star fought back tears as he watched the video, with a source telling us: "Ryan burst into tears when he watched the video of Lucy with the mystery man and feared the worst.
"She explained he’s just a friend and said she would never be so silly as Ryan’s mate was in Dubai at the same time.
"Ryan is a very emotional person who wears his heart on his sleeve.
"He is convinced that there’s more to it than the video shows, but Lucy insists she has nothing to apologise for.
"They’ve been having some heated chats on the phone.
"At best it is very poor judgement on her part and he doesn’t want to think about what the worst case scenario is."
Meanwhile, Lucy lashed out at reports she'd cheated on her boyfriend, telling followers: "Since when has saying goodbye to a friend turned into a cosy night out?! #ridiculous".
Ryan and Lucy met last year while filming the reality show Celebrity Island with Bear Grylls for Channel 4.
They briefly split in June following an explosive row, but got back together days later and have recently been making wedding plans for the future.
In November 2011 Lucy was at the centre of another cheating scandal when she admitted to then-boyfriend Mario Falcone that she had lied to him about spending the night at Mark Wright's house.
The Italian star was left furious that Lucy had been dishonest to him for two months, promptly dumping her in dramatic scenes for ITVBe reality series The Only Way Is Essex.
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