Sheryl Crow, 44, donned a lilac-colored bikini for the last minutes of the final show of her six-week tour with John Mayer. Mayer has three photos of her bikini moments on his blog at JohnMayer.com. (Scroll about halfway down the page to see the images.)

How does Sheryl Crow stay in such great shape? Apparently she likes to run or bike outdoors for at least an hour every single day. She also takes a fish-oil supplement every day to keep her skin and hair hydrated.

Update July 2008: Crow is starting her own fashion line at age 46. See Sheryl Crow's Jeans.