Pop sensation Ke$ha teased fans yesterday with a clip of herself singing part of her new single 'Die Young' and she has now been posting cryptic photo messages to her official Twitter page.

Following the unveiling of her impromptu Tokyo subway performance of the track last night (September 17), the hitmaker returned to the social networking site and uploaded 3 photos sent via Instagram that show three different letters.

The first image is of a Waffle House waitress holding up a napkin with the letter 'r' on it, which is stylised similarly to Rihanna's 'Rated R' logo, and the other two pictures display the letters 'a' and 'o'.

The initial 'r' image was accompanied by the teasing caption "what's it all mean???" and fans have been speculating that it might be hinting at a possible collaboration with the Bajan beauty herself as the pair toured together a couple of years ago.

Although 'Die Young' is yet to be given an official release date, the songstress recently explained that it will be available later this month.