R+B sensation Rihanna is looking to become the latest star to release a work-out video after teaming up with Madonna's choreographer on a new dance fitness venture. The toned Caribbean singer has collaborated with dance guru Jamie King on a new dance Nikewomen.com work-out, which can be downloaded by fitness fans. The PON DE REPLAY hitmaker says, "Jamie King is gonna pop in a little box and teach you the moves step by step... It's a fun work-out."