The star, 25, looked stunning in the cheeky ensemble which she teamed with a simple gold chain and smokey eye make-up.
The star joined celebrities including Alan Carr and Years & Years singer Olly Alexander at the event held at the Sheraton Grand in Park Lane.
Her appearance came after she revealed the band have started work on their fifth album.
The singer last week shared a snap of her in an audio booth and wrote: "first recorded song of #LM5 ✔".
Perrie Edwards, 24, Jade, Jesy Nelson, 26, and Leigh-Anne Pinnock, also 26, sent fans into a tizzy when they announced the new record will be released later this year.
The girl group confirmed the news on Twitter saying: "It's official…
"#LM5 is actually in the works… We're going to be patiently waiting for this one, it's going to be an absolute dream!"
Leigh-Anne previously said in an interview: "We have the new album coming out this year which is really exciting."
The band recently broke a 20-year long record held by the Spice Girls in the UK charts.
They have earned two new UK chart certifications with their album Black Magic going Double Platinum in the UK after selling 1.2million copies and No More Sad Songs becoming their ninth platinum single.
Little Mix now have nine Platinum certifications meaning they have the most of any girl group ever in the UK as the Spice Girls earned just eight.
The girls also won three awards at the Global Awards recently.
The X Factor winners failed to bag an award at this year's Brits however – and fans were furious.
Taking to Twitter in their droves, they accused organisers of “rigging” the vote when Harry Styles beat the girls to win the award for British Artist Video Of The Year.
Some even called for the Brits to release the voting figures to prove the former One Direction star was the definitive winner.
Little Mix were trending worldwide on the night so naturally their loyal fans were disappointed when they didn't end up winning the award.
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