Tips from the Stars on How to Slim Down for Summer

Stars are slimming down for summer to bare those bikini bodies, and “Extra” is giving you the skinny on their secret diets!

Hillary Duff, who heated up the pages of Maxim magazine and is proud to be showing off her figure, recently dropped down to 109 pounds!

She once reportedly said she had been “obsessed” with her weight after tabloid headlines said she could lose a few pounds.

After realizing she wanted to be healthy – and not super-skinny – Hillary started eating right and doing Pilates workouts four times a week.

She said that instead of counting calories, she relies on lots of greens, lean protein and fresh fruit.

Howard Stern's sassy sidekick Robin Quivers has transformed her body in less than a month, thanks to the Martha's Vineyard Diet Detox.

“I'm down 24 pounds in 21 days,” Robin happily told “Extra.”

It's the 21-day juice diet that has Robin crying for joy.

“I was in tears,” Robin explained. “I looked at myself in the mirror yesterday, and I almost didn't recognize the person looking at me.”

New mom Kristi Swanson just started the Medifast program to shed the 30 pounds she gained during her pregnancy, and the actress told “Extra” she's already seeing results!

“I've almost lost seven pounds already, and it's amazing,” she gushed.

“Desperate Housewives” star Marcia Cross and “Extra's” own Dayna Devon have also been busy losing baby weight.

Marcia reportedly shed her 65 pounds of pregnancy weight by staying away from junk food.

And Dayna, who put on 24 pounds with son Cole, also lost it by working out four times a week.