Pop star Halsey threw a star studded Halloween Party called the Gotham City Party last night in Los Angeles. And the biracial singer is going viral, for the extremely sexy costume that she chose.

Halsey decided to go as Batman's arch nemesis Posion Ivy. And well, there wasn't much to the costume, aside from all the green paint.

Here are some pics of the singer - which has her trending on Twitter today.

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Halsey and her longtime boyfriend G Eazy have been having an on-again off-again relationship. The couple publicly broke up this summer, only to reconcile last month.

But G Eazy was not Halsey's date to her Halloween party. So that suggests that their relationship is "off" as of last night.

Halsey let her fingers do the talking Wednesday, following reports she and boyfriend G-Eazy had split again.

“@ me: life is not pain vs happiness. one does not replace the other. they exist together. happiness doesn’t arrive as a replacement. it arrives to assist u in carrying the weight of the pain,” the “Without Me” crooner tweeted, later adding, “@ me: now remember that u dummy.”

Following a brief breakup earlier this year, Halsey, 24, and G-Eazy, 29, reunited in late August. After celebrating the singer’s birthday in Italy back in September, the couple turned heads on the red carpet at this month’s American Music Awards. People reported Monday that the twosome called it quits.