Lady Gaga reveals photos of her slumber party with Lindsay Lohan

For those who thought the Lady Gaga-Lindsay Lohan sleepover was too good to be true … now there's photographic evidence. On Thursday, the "Born This Way" singer posted a bunch of pictures from that much buzzed-about July 11 night at the Chateau Marmont in West Hollywood, California, which also included singer Lana Del Rey, on her new social networking site LittleMonsters.com. Although Del Rey is not actually pictured (perhaps she was the one behind the camera), Lohan and Gaga do their best mugging (along with photographer Ellen von Unwerth). Too bad LiLo insisted on striking that tired finger-biting pose she always does! Although the report at the time of the sleepover was that the superstars had a PG night of watching movies and playing board games, the ladies' blurry eyes tell perhaps a different story.

Lohan, 26, is the subject of the other three images. In one, the actress — wearing a tiara and fur coat — is having a cigarette lit for her, while in another von Unwerth is playing with her red hair. "I love to stay up late and take pictures of beautiful celebrities," Gaga wrote in one of the photo captions.

Other big news that Gaga, 26, shared on Thursday is that she will make her acting debut in "Machete Kills," the sequel to the 2010 Robert Rodriguez action-packed thriller, which coincidentally featured a cameo by Lohan. Gaga will play a character that doesn't seem to be much of stretch: La Chameleon, a glamorous woman who wears fur and diamonds … and carries a gun. According to IMDB.com, Cuba Gooding Jr. is playing El Chameleon.

"Machete Kills" is expected to hit theaters next year and will also star Mel Gibson, Jessica Alba, Sofia Vergara, Amber Heard, and Charlie Sheen.

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