The 31-year-old singer's apparent booze session became too much for her to handle as she later fell unconscious and had to be carried off by her new boyfriend MC Meridian Dan, reported Female First.
The incident happened backstage while her singer beau and ex-boyfriend Seb Chew performed their grime set.
Once they finished their gig, the duo carried Allen through the crowd of party-goers before she came round and vomited.
The "Smile" hitmaker later took to her Twitter account to claim she hadn't drunk too much but is a "lightweight" when it comes to drinking.
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