Little Mix were called out for their One Love concert outfits and fans are fighting back.

Fans of UK girl band Little Mix have been forced to defend their favourite pop stars after the group was slammed online for their outfits at the One Love Manchester benefit concert on Sunday evening.

Taking to the stage alongside Coldplay, Katy Perry, Miley Cyrus and Robbie Williams for the fundraiser, Perrie Edwards, Jesy Nelson, Jade Thirlwall, Leigh-Anne Pinnock wore coordinating black-and-white outfits and performed their hit song, ‘Wings’.

"We are so, so happy to be a part of this incredible day, thank you," the band said, adding, "The song we've chosen to do for you guys, we wrote together a few years ago, in the hopes that it would empower people to stand together and to not let anything bring them down."

But within minutes of wrapping their set, the band were under fire, with people deeming the group looked like "hookers".

"Can't deal with the outfits Little Mix wear," one viewer tweeted. "They're at a memorial concert looking like they're about to go a strip club."

Another viewed asked, "What is with Little Mix and their slutty outfits all the time?"

Others, however, felt that critics of the outfits were missing the point of the event altogether.

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"Little Mix are making victims of terror feel good for 5 mins. Who cares what they're wearing?Really!!!???" one viewer tweeted.

"I can't believe there are people criticising Little Mix for their outfits right now..." another agreed.

"people judging my girls little mix's outfits bc [because] they weren't "lounging gear" idc [I don't care] they still slay and did a great performance shut up," one fan tweeted.