Sheryl Crow, 50, Rocks Toned Body in Tiny String Bikini

No tankinis for this 50-year-old singer!

Sheryl Crow was snapped on Dec. 9 chatting on her cell in the Bahamas wearing a tiny string bikini. Standing in the surf, the "Soak Up the Sun" singer looked amazingly toned and trim.

(Interestingly, she revealed this past September on Katie Couric's talk show that she believes her non-cancerous brain tumor resulted from constant cell phone use.)

The single mother of two has credited her slammin' bod to doing P90X (Power 90-Day Extreme) workouts, a series of intense exercise sessions coupled with a diet plan. The 12-DVD workout set is hawked in an infomercial.

Crow, who once dated disgraced cyclist Lance Armstrong, is a noted fitness enthusiast. Besides jogging and yoga, she also runs around after her two adopted sons, Levi, 2, and Wyatt, 4.

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"A family doesn't always look like girl meets boy, they fall in love, they get married, they have a kid," Crow once told Parade. "I said, 'OK, I'm going to let go of what I think things are supposed to look like, because I can't control anything. When I try to control things, that's when I keep things from happening."

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