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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It's BONECRUSHER's "Fatcrushers" against CARNIE WILSON's "Chili Con Carnie" team when the fourth season of "Celebrity Fit Club" takes to the racetrack this Sunday night on VH1! The super-sized celebrities are racing on recumbent bikes at the Irwindale Speedway in greater Los Angeles -- and each team has to complete the 10-mile circuit.

"I want to win," declares NICK TURTURRO, who gets angry when he feels one of his team members isn't pulling her weight. Later that day, Nick is questioned on his strong stance by psychologist/body image expert Dr. LINDA PAPADOPOULOS. He explains, "It is for the team. They don't get me. They go, 'He is angry.' You people are dead inside. I don't want to feel dead inside."

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CARNIE WILSON has been one of our favorite "Weight-Loss Queens" since losing 20 dress sizes, following gastric bypass surgery in 1999. But the new mom packed on the pounds when she got pregnant with daughter LOLA. Since giving birth, she's lost a lot of the weight she gained, but with 40 more to go, Carnie signed up for the fourth season of "Celebrity Fit Club" to help her make her goal.

"I may be this person known as the spokesperson for gastric bypass, but I have struggles and challenges too. I'm only human," she tells ET's JANN CARL in a revealing interview.

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Platinum recording artist CARNIE WILSON, TINA YOTHERS ("Family Ties"), VINCENT PASTORE ("The Sopranos"), R&B singer ANGIE STONE, NICK TURTURRO ("NYPD Blue"), ERIKA ELENIAK ("Baywatch"), rapper BONECRUSHER and TED LANGE ("Love Boat") -- the eight celebrities who signed up for the fourth season of "Celebrity Fit Club"-- had one last indulgence before beginning the stringent weight-loss program: A pig-fest at an ice cream parlor that turned into a food fight with all the toppings winding up airborne and sailing into their hair and down their shirts!

It was a fun start to a grueling diet and exercise regimen, but then it was down to business as usual as the plus-sized group is dunked in a water tank (to determine the percentage of their body fat), tested to see how many push-ups they can do, how fast they can run and how far they can jump -- all before facing the scale.

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How do Hollywood's biggest stars get fit for summer? ET has the top 10 celebrity diet secrets with help from MEAGHAN BUCHAN, fitness director for Self magazine!

A good start to a healthy diet? Drink lots of water. KELLY CLARKSON is a water girl, Vitaminwater™! As part of her diet plan, Kelly has gone cold turkey on sugary sodas and switched to Vitaminwater. She's so serious about the change that she signed a deal with Glacéau's Vitaminwater bottled beverages. "Why I love the Vitaminwater campaign is a lot of kids just down soda and it's not good," the pop rocker told ET last month. "Obviously, I have a lot of young fans, so that's why we teamed up. I just realized that I have a platform. If you have a voice, you might as well make it a positive one."

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What do JENNIFER ANISTON, JULIA ROBERTS, NICOLE KIDMAN and BEN STILLER all have in common? They turn to the experts when it's time to get in shape!

One such specialist is KATHY KAEHLER, personal trainer to the stars, whose clients have included Jennifer, Julia, MICHELLE PFEIFFER and DREW BARRYMORE, just to name a few.

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