Ke$ha has left the door open for a collaboration with Justin Bieber, saying that she would "sure as hell" like to work with him.

Speaking to V magazine, Ke$ha revealed some of the names she would love to work with in the future.

She said she would one day like to team up with Rolling Stones guitarist Keith Richards, and also the Flaming Lips too. She said:

"The range of artists I want to work with is so vast, it's bizarre. I would love to have Keith Richards on the record. I would sure as hell like to do a collaboration with Bieber and at the same time do a song with the Flaming Lips. If someone is a real artist, you can't confine them to a particular genre. It's my mission to make it all make sense somehow."

Ke$ha also opened up on her place in the music industry, admitting that she feels like the "dirty little sister" to some of the world's big pop stars. She said:

"I do feel like there are the pop stars of the world and then I'm like their dirty little sister, running around with s**t on my face in combat boots because I can't walk in heels."