Memorial Day has come and gone and with it the oh-so-comfortable bulky sweaters and concealing sweat pants of winter. Now, it's time for skimpy sun dresses and bikini bathing suits. Don't despair! It's not too late to get into shape for the sizzling days of summer -- and ET's favorite celebs tell you how they do it!

CHRISTIE BRINKLEY loves to jog and go kayaking; "Dancing with the Stars" judge CARRIE ANN INABA stays fit with aerobics and kick boxing; and this year's "DWTS" champ KRISTI YAMAGUCHI's secret is a healthy, balanced diet.

ET also turned to OPRAH WINFREY's health and fitness guru, radio host and best-selling author BOB GREENE for his thebestlife.com tips on how to get swimsuit svelte.

"Diets don't work," declares Bob, who takes us into the kitchen to prepare a healthy meal. "Exercise and reducing calories without depriving yourself is the key to losing weight in a healthy way."

Bob advocates salads as an excellent taste treat, as well as a nutritious meal. He recommends Wish-Bone® Bountifuls™ salad dressings to inspire creativity -- plus they don't run up the calorie count. Each serving only has 35 calories or less, depending on the flavor.

One of his favorite dishes is the Tuscan Tuna Salad, which uses Tuscan Romano Basil Dressing, tuna, white kidney beans, olives and bell peppers -- and only takes 10 minutes to prepare!