Last night Lindsay Lohan, Lady Gaga and Lana Del Rey had a "slumber party" at the Chateau Marmont, and a source close to the threesome tells X17online exclusively that they were "watching old movies and playing board games." No partying or trashing their room? My, how they've grown up!

It was Lohan who brought the ladies together because she stays at the hotel so much, and our source tells us, "The three of them had dinner in the garden on Tuesday night at Chateau, and then Lindsay and Gaga ran upstairs to play dress up and came down in different outfits." Apparently that's how they all became friends and decided to hang out, and we're not sure what this means, but Lilo tweeted, "#skinnysnack1‬ @ladygaga hahaha."

Given their love of tattoos, bad boys and fashion, we're sure the girls had plenty to talk about! Think we'll be seeing more of the new BFFs out and about in Hollywood? Here's to hoping!