The 'Tik Tok' star was recently forced to deny claims that she had sexual relations with Bieber after a wild lawsuit - purportedly filed by Selena Gomez's father - claimed that the pair had slept together.
However, Ke$ha has now told Rolling Stone that she would consider bedding the 'Boyfriend' star after rumours that he has split from Gomez.
"Sure," E! News quotes her as saying. "Wait, is he even legal? Could I go to jail for this?"
Ke$ha - who has previously suggested that she has had sex with a ghost - was then reassured that Bieber is of age.
"Okay then, I would [have sex with him]," she said. "We could go out and buy lottery tickets, vote, play putt-putt golf. All the things that are legal at the age of 18."
Bieber is now thought to have reunited with Gomez, after reports claimed that they were seen kissing in New York.
Watch the video for Ke$ha's 'Die Young' below: