Taylor Momsen recorded Jenna Haze having an orgasm for her album 'Going To Hell'.
The ex-porn star can be heard reaching a climax throughout the introduction to the song 'Follow Me Down', after she was called on by the former 'Gossip Girl' actress to provide a sexy addition to a record by her band The Pretty Reckless.
Taylor, 20, told Revolver magazine, "I don't want to give her personal life away away but... she super helped me out. She's one of my very close friends."
While Taylor admits that Jenna's moans sound convincing, she warned male fans that the adult entertainment star had faked the noises and they would be left disappointed if they attempted to track down footage to match the audio.
She added: "It's a performance... [that's] one of a kind, so don't go looking for that on the Internet."
Taylor and Jenna, 31, have been best friends for a long time and have often been involved in a string of sexy antics together.
In 2012 the pair posed topless for a photoshoot in FHM magazine, before Jenna treated Taylor to a lap dance and gave her a passionate kiss on stage during a The Pretty Reckless gig at the House of Blues in Los Angeles that same year.