The 'Wings' singer was romantically linked with Loveable Rogues' Eddie Brett last week when they were seen leaving a friend's birthday party in London together.
But according to Jesy there is absolutely nothing romantic going on.
Tweeting from the Little Mix official account, she said: "Id like to confirm that I am actually single :) much love xjesyx."
Clearly some people weren't convinced, as she then followed up with: "I would once again like to confirm that I am NOT with Eddie from the Lovable rouges much love Jesy."
She added, "#Single" just to really get her message across.
Jesy had been dating Diversity star Jordan Banjo as recently as May, when she tweeted a picture of them looking loved-up while cuddling in bed.
There's no word yet on when - or why - they broke up.