Shakira told Glamour that Rihanna is sexy. How sexy? Shakira thinks Rihanna is the "Sexiest woman on the planet," and Shakira should know. She's been called pretty sexy herself and Rihanna is just another Caribbean girl with great chemistry.

Shakira is Glamour's cover girl this month and she dished about her upcoming Rihanna collaboration, working on the voice and Adam Levine. The "Hips Don't Lie" singer was too much for just one shot. Shakira graces both front and back Glamour covers. Glamour's February issue is the "hair flip" issue filled with hair ideas.

Shakira is the face of Glamour in the February issue. The cover shoot was done by Nicolas Moore. Shakira's hair was done by Kim Kimble and her body is to die for. The 36-year-old mother of Milán Piqué can give Rihanna a run for her money as the 'Sexiest Woman On The Planet.'

Shakira says working with Rihanna was "utopia." Shakira and Rihanna's upcoming single "Can't Remember To Forget" was written by Erik Hassle.

Talking about Rihanna Shakira said "We've been keeping it under secret (the collaboration), but we just shot the video. I never thought we could come together - with me on The Voice; taking care of my baby, Milan; Rihanna touring. But working with her was utopia. Working with her was utopia. She's the sexiest woman on the planet. And at the end of the day, we're both just basically Caribbean girls. The chemistry was so good and so real. She taught me dance moves. She was a sweet teacher."

But being the only woman working with men like Adam Levine on "The Voice" was an education. She said "I've learned I have to be a good sport."

Shakira had to work it to move up in entertainment, "Success happened little by little for me. I tasted the flavor of fame in small doses: I started at 10 years old when I won a music contest; I was performing at birthday parties, company meetings. I met with a record executive when I was 13 and sang 'Material Girl' to a cassette-tape boom box. I've shaken hands at every radio station, from Honduras to Ryan Seacrest. One day [I realized I was famous] enough. But here's the thing: I'm still hungry. But I'm not hungry for fame - just the need to prove myself that I can still do this".

The Shakira of the February 2014 edition of "Glamour" magazine hits newsstands across on January 14th.  "Can't Remember to Forget" is due out January 13.  It will be on Shakira's upcoming album, the follow-up to Sale el Sol from 2010. "The Voice" returns on February 24 on NBC.