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Who knew Lady Gaga and Lindsay Lohan were this close?

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Lady Gaga had a sleepover with Lindsay and photographer Ellen von Unwerth at Lindsay's frequent hangout, the super-exclusive Chateau Marmont in West Hollywood earlier this month, and now she's sharing some pics from the girls' night out.

Related: Lady Gaga Bares Bod in Risque Ad

Like any good sleepover, the girls apparently played dress-up, Lindsay sporting a fur coat in some pics and Lady Gaga wearing a shiny tiara and jewels.

"I love to stay up late and take pictures of beautiful celebrities," Gaga writes in a caption for one of the three photos she posted on her website LittleMonsters.com.

Related: Lady Gaga 'Kills' in Movie Debut

But the two's surprising friendship isn't as random as one might think. Lady Gaga just announced that she'll be making her film debut in Robert Rodriguez's Machete Kills, and Lindsay starred in the original 2010 film Machete.