Mariah Carey beats Rihanna as Ultimate Pop Star

Mariah Carey has beaten Rihanna to the top of a new poll to find the Ultimate Pop Star.

Time magazine bosses have measured artists' hits, chart placements and longevity since 1960 in an effort to find the biggest hitmaker - and Carey has been named the new queen of pop.

Rihanna comes in at two and Usher at three, while the Beatles and Madonna round out the top five.

Janet and Michael Jackson also make the top 10, alongside Whitney Houston, Katy Perry and Boyz II Men.