The hashtag was started by Constance Hall, a 32-year-old mother from Australia, who shared a photo of herself stood in her bra and knickers, balancing her baby on her hip.
"Love yourself the way you want your daughters, nieces, friends kids to love themselves," she wrote on Facebook.
Hall then uttered a rallying cry for others to: "take a picture of yourselves, a picture that society has deemed you unfit for, because your too old or skinny or fat or you've had too many kids or not confidant enough or for whatever reason you have been made to feel like you don't deserve to love your body or your self.
"An undie shot, bathers shot, a grape eating shot brig fanned by a naked Greek man shot, whatever [sic].
"Hashtag #likeaqueen and yes, nominate your spectacular queens friends. And let us sit around drinking self worth a queen vibes from a champagne glass. Because our royal bodies deserve so much more."
Why 'like a queen'? We'll let Hall explain.
"Like a queen you guys.
"She eats the cake!
"She has a past and she owns that shit,
"She's skinny, curvy, flabby, muscly and she loves it.
"Because she's a fucking queen."
In less than 12 hours the post received more than 5,000 comments, with many women sharing their own underwear or bikini photos.
She has also shared a candid post about the frustrations of being a stay-at-home mum whose partner goes out to work.