kimberly caldwell

This weekend the stars came out in full force to take place in the Nautica Malibu Triathlon. The popular race is a favorite among celebs because of its close proximity to Hollywood, but more important, they participate to raise money for a good cause: the Childrens Hospital Los Angeles and its Pediatric Cancer Research Program. This year, TV host Nancy O'Dell emceed and former America Idol contestant Kimberly Caldwell lent her chops to sing the national anthem.

Actress Teri Hatcher competed in the tri for the second year in a row joined by fellow stars Rachel Griffiths, Josh Hopkins, Julie Bowen, and Mark Feuerstein. Gilles Marini, Trevor Donovan, and James Marsden also ran, bike, and swam in the 24th annual event. The triathlon consists of a half-mile swim, an 18-mile bike ride, and a four-mile run — yowza! It looks like Hollywood is brimming with the fit and fabulous!

For shots of all these competitors, keep on reading.

Two years ago former American Idol contestant Kimberly Caldwell got serious about her diet and lifestyle, shedding 20 pounds in the process. Most important, she's kept up with the changes she made then and hasn't gained the weight back. Crediting yoga for her lean figure and working out for keeping her calm, Kimberly shares her tricks for getting slim and staying that way in the July issue of Shape. Check them out here:

• Keep workout gear on standby: Kimberly says to always keep fitness gear with you, especially when traveling. Whenever she goes on tour, she always takes two things with her — a pair of sneakers and a sports bra. This ensures that she'll be able to go for a run or hit the hotel gym.
• Beware of sneaky diet saboteurs: Even light fare can be packed with calories, which is something Kimberly learned from her trainer. As a result, many of her sauces are now dips: "I'm from Texas and I used to have chicken smothered in it [barbecue sauce] . . . So now I get it on the side and just dip — I still enjoy the taste but save on tons of calories."
• Take the guesswork out of exercise: To make things easier, Kimberly works out with a trainer or goes to fitness classes. For her, taking direction is a way to maximize results. Frequency doesn't hurt either — Kimberly says she works out "three to five days a week."