Demi’s near 13 million followers joined in by tweeting their own snaps to the star, who went about retweeting them, gushing: “So many GORGEOUS faces.. Not enough battery left on my phone!!! Haha love you ALL!!! ❤”
With Millie Mackintosh posting her own minimal look soon after, we look back at some of the best make-up free selfies from the celeb world…
DEMI LOVATO
'Ladies, be brave today.. take off your make-up and stop using those filters!!'
Demi Lovato posted this fresh-faced selfie to encourage female followers to embrace the natural look: "Ladies, be brave today.. take off your make-up and stop using those filters!! WE are beautiful!!!" She tweeted.
MILLIE MACKINTOSH
"Love looking like a boy!"
Made In Chelsea's Millie Mackintosh followed suit by tweeting a snap of herself at a photo shoot wearing minimal make-up. The glamorous reality star posted the photo of her wearing little make-up with her long hair pulled back into a quiff. She wrote: "love looking like a boy!"
KELLY BROOK
"Bed head"
Last month Kelly Brook (no stranger to a Twitter selfie!) allowed followers a glimpse of her before applying her makeup in the morning. The Celebrity Juice Presenter posted a photo of herself in bed with the caption "bed head"
JESSICA SIMPSON
"Fun in the sun"
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It was Jessica Simspson's cleavage that grabbed the attention of her followers in this makeup-free photo of the star on a family holiday in Hawaii at Christmas. "Fun in the sun" tweeted a bare-faced Jessica.
HOLLY WILLOUGHBY
"Lunch done, Me however still in nightie! Make-up!"
Holly Willoughby posted this snap of herself on a morning off last year. The morning TV presenter confessed she had been cooking Sunday lunch while still in her night clothes, tweeting the photo as evidence. She wrote: "Lunch done, Me however still in nightie! Make-up!"
KELLY OSBOURNE
"Just found my favorite pj's!"
Kelly Osbourne's pyjama photo was shared by millions last year, attracting more attention for Kelly's newly skinny waist than her bare-faced look. The Fashion police presenter tweeted: "Just found my favorite pj's! Got to be up at 5am for @e_fashionpolice thank god for my jet lag & comfy bed."
LADY GAGA
"Have a beautiful day!!"
Famous for her outlandish makeup and fashion accessories, Lady Gaga tweeted this rare photo of her looking natural last year. The singer posted the snap along with the message: "Have a beautiful day!!"
RIHANNA
"Just got 'laid'"
No stranger to a controversial tweet, Rihanna's followers were treated to a bare-faced image of the singer when she posted a picture of her in bed with the caption "Just got 'laid'"
NICOLE SCHERZINGER
"Uhh...Does anyone know how to work this twisty towel thing? Haha!"
Nicole Scherzinger had us all wishing we had her flawless skin when she posted a photo of herself in her hotel room during a holiday in Mexico last year. The Pussy Cat Doll joked: "Uhh...Does anyone know how to work this twisty towel thing? Haha!"
KATY PERRY
Russell Brand posted this unflattering pic of his now ex-wife before swiftly taking it down
Saving the best until last, it was Russell Brand's cheeky post of Katy Perry's morning face that will go down in history as the best makeup-free celebrity Twitter pic. The comedian posted an unflattering picture of his now ex-wife before swiftly taking it down in 2011.