In a series of snaps shared to the Little Mix official Instagram account, Edwards posed with an empty champagne flute, pretending to get the party started.
“Touch down in Vegas,” the picture said. “Can tell it’s gonna be a good one…!”
The girls appear to be sitting in the back of a super-sized limo.
“Hitting the Vegas town with the lasses tonight,” Little Mix wrote of a second, similar photo.
The star wore a white, lace crop top and grey pants for her stint at gambling.
“#DoingAPhoebe I love Vegas,” she wrote.
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Sources told PEOPLE that Edwards was “devastated” after Malik, 22, broke up with her.
“She’s been putting on a brave face, as Little Mix have had promotion to do, but she’s obviously devastated,” the source told PEOPLE.
Earlier last week, the star got all dolled up while the girl group promoted their hit single “Black Magic” in California.
On Friday, Edwards unfollowed Malin on Instagram and apparently deleted every picture of them together from Instagram.