Halsey hosted Playboy's Midsummer Night's Dream party Saturday night in Vegas ... and she did not disappoint.
The bash went down at the Marquee Nightclub inside the Cosmopolitan on the Strip. She was joined by bunnies ... not sure if they're real Playboy bunnies or faux, but it truly doesn't matter.
The event used to be held at the Playboy Mansion in L.A. ... this one's a spin-off.
The suggested attire for the evening ... lingerie and sleepwear, of course.
Hef may be gone, but Halsey is making damn sure ... his memory will live on.