The singer further teased her new single 'Die Young' yesterday by posting a video of herself singing the track on the Tokyo subway in Japan.
However, shortly after Ke$ha uploaded an image of a lady holding an image of an 'R' that is remarkably similar to Rihanna's trademark logo.
She added: "what's it all mean???"
'Die Young' will serve as the lead track from Ke$ha's upcoming second studio album and is expected to be released later this month.
Previously speaking about her new album, she explained: "The first two records talked more about partying, which is a great, magical part of life, but some songs on the new record are more personal and vulnerable."
Watch Ke$ha perform her new track 'Die Young' on the Tokyo subway below: