The singer joined band mate Jade Thirlwall at Mahiki club on Thursday evening (20 June) for a spot of mid-week fun to celebrate a friend's birthday.
Jesy and Jade had spent their day working on new music with the band. A post uploaded to the group's official Twitter revealed they were working on lyrics… although the picture added alongside the message seemed to suggest they hadn't got far!
The band – which also includes Perrie Edwards and Leigh-Anne Pinnock – are just back in the UK from a successful promotional trip to the US, where they saw debut album DNA zoom into the charts.
The former X Factor winners even beat the record set by the Spice Girls for the highest number of debut albums sold in a week in the US by a British girl band. Not bad, eh?
Apparently the girls received 25 bottles of champagne from Simon Cowell as a congratulatory gift… We wonder how they split them between four people?
He added on Twitter: "Congratulations little mix. Very proud of you. X."
The future is definitely bright for Little Mix!