Perrie has now put the medical drama aside to join her bandmate at her birthday bash in the capital last night.
She looked stunning in a PVC skirt and jacket, teamed with a white T-shirt.
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The singer wore her hair in a bun and was seen holding hands with Jade Thirlwall, who looked chic in a pink strapless dress.
The pair stuck together as they headed to the glitzy party to join the rest of the band at Gilgamesh in Camden, north London.
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Birthday girl Leigh-Anne looked sensational in a lace-up yellow outfit, which featured a short skirt, a strapless top and a matching coat.
Fellow Little Mix star Jesy Nelson went for a more casual outfit in a camo trousers and a skimpy bra top.
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She was later seen being helped home by friends.
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Perrie, currently dating footballer Alex Oxlade-Chamberlain, fell ill earlier this week during the group's trip to Sin City.
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At the time she apologised to her American devotees and explained why she couldn't perform at the Daytime Village 2017 Capital One event after her medical scare.
In an online post, she wrote: “Hello beautiful babas. I’m out of hospital…in my own bed and on the mend.
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"Thanks to mother goose, nurse sam and doctor Hatchi I should be fine in no time.”
She went on to apologise further to devoted Mixers, saying: “Sorry to have let you all down, I obv would never want to miss anything but sometimes you have to listen to those who know best and I wasn’t fit to perform.”
Perrie added: “Thank you to the lovely doctors and nurses at Sunrise hospital in Vegas for looking after me.
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