Busy actress/mother of two MELISSA JOAN HART is always on the go, and fitness guru BOB GREENE is helping her stay fueled up and in shape with a fast, healthy meal!

Tonight on ET, the author of The Best Life Diet shows the former "Sabrina, the Teenage Witch" star how to create a tortellini and salmon salad using ingredients approved by his "Best Life" way of living, such as Wishbone Bountifuls Hearty Italian Dressing!

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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.

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