Yep, the Stranger Things star looked unrecognisable as she traded in her go-to brown bob for a long, blonde 'do that had been clipped back from her face, with bouncy curls at the end.
"Hey ken!" she captioned the post, referencing Aqua's iconic 1997 hit Barbie Girl, also tagging her boyfriend and the professionals who helped her achieve the stunning new look.
The stylist behind Millie's hair overhaul is Pete Burkill, who has worked on the actor's hair for quite some time, as well as other celebs including Kylie Minogue and David Beckham. Over on his own Instagram, the hair stylist shared a photo of the look and details of how he pulled it off.
"Happy 18th beautiful @milliebobbybrown. Thanks for trusting us to have so much fun with your lewks. Blondes have more fun right?" he wrote in the caption. "Hair by me @peteburkill using @sachajuanuk @ghdhair."
And Millie's fans are clearly just as in love with her new look as we are, with her post racking up over 4.5 million likes in just a few hours. Over on Twitter, there's plenty of praise for her blonde hair too, as fans shared their support for the Barbie inspired look.
"Millie Bobby Brown appreciation tweet with blonde hair," wrote one fan, with another tweeting: "Petition for Millie Bobby Brown to dye her hair blonde!!!! Blonde is her colour!!!"
BRB, off to buy some blonde hair dye...
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