Millie Bobby Brown Dresses Up as Sexy Elf to Promote Fashion Line

Millie Bobby Brown is spreading Christmas cheer with her new line of underwear … giving fans an early gift by dressing up as a sexy Elf on the Shelf.

This outfit probably won’t keep Millie warm at the North Pole … after all, it’s just a skin-baring crop top and a pair of booty shorts with a thick black belt and a long Santa hat — though it’ll certainly get her fans feelin’ a little hot under the turtleneck.

Millie said she’s not an Elf on the Shelf … but, instead, a “Mill on a sill” — ready to report back to Santa on any naughtiness she spies.

MBB also shared a video where she describes the full ‘fit … ending the clip with a cheerful “ho, ho, ho” and flirty laugh

Of course, Millie’s already giving “Stranger Things” fans a huge Christmas present … because the second half of the series’ final season will come out on Christmas Day.

The show might be a better fit for Halloween, to be fair … but, after the huge hiatus between Season 4 and Season 5, no one’s kicking up too much of a fuss.