The Stranger Things actress, 20, took to the stage at The Electric State panel on day one of New York Comic Con.
She was seen wearing slinky bejewelled grey micro shorts and a matching bodysuit with a high neck and long sleeves.
She teamed the disco-ready ensemble with a pair of sheer black stockings and black stilettos, as well as statement sparkling earrings.
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The star of the show however were her dazzling diamond engagement and wedding rings. Her engagement ring features a cushion-cut halo diamond on a pavé band.
The star married her model beau in a stunning custom Galia Lahav gown covered in lace. She also wore a trailing lace-adorned veil which was styled into her face-framing updo.
"Forever and always, your wife," the actress penned as she shared gorgeous photos from their special day.
For the evening, Millie slipped into a stunning satin mini dress by Oscar De La Renta while the groom was handsome in a Tom Ford suit.
Star-studded outings
The married couple were spotted prior to tying the knot in March at the Damsel world premiere at The Plaza. The Netflix star looked incredible in a grey beaded dress in a scalloped print to look like scales.
The thigh-split number was teamed with strappy heels and tumbling locks that couldn't have been further from the cropped hairdo she wore as Eleven in the early seasons of Stranger Things.