Lindsay Lohan was "watching old movies and playing board games" at a slumber party with friends Lady Gaga and Lana Del Rey this week.

The actress arranged an impromptu sleepover with her pop star pals at the Chateau Marmont in Los Angeles.

Lindsay frequents the ritzy West Hollywood hotel and was excited to engage in simple fun with her girlfriends, without the aid of stimulants or cute boys.

"They were watching old movies and playing board games at the slumber party," said a source.

The trio giggled their way through classic sleepover activities.

"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," the source revealed.

Lindsay and Gaga seem to have lots of inside jokes about their night of girly merrymaking.