Pop star Shakira, who has teamed up with R&B star Rihanna for a new single, feels the latter is the sexiest woman on the planet.

The 36-year-old 'Whenever Wherever' hitmaker has collaborated with Rihanna for 'Can't Remember to Forget You', which is expected to be released next week, reported Daily Mirror. "Working with her (Rihanna) was utopia. She's the sexiest woman on the planet.