April 14, 2014 08:10 PM

CL/Splash News Online

Jessica Simpson better get used to turning heads with her fit new physique. After hitting her goal weight last month, the star continues to work on her slim-down, stepping out in bright dresses that really showcase the result of all her hard work.

Most recently, she hit the red carpet in a slim-fitting yellow dress at the John Varvatos Stuart House Benefit in L.A. that got people buzzing, so we asked: What’s the key to the Weight Watchers spokeswoman’s continued success? As it turns out, diet and exercise (imagine that!); she’s still sticking to her points and remaining active at the same time, says a source close to Simpson.

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That means working out with trainer Harley Pasternak for 45 minutes three days a week, focusing on “everything. She needs to look good all over,” the source says. When she can’t meet with Pasternak, “She goes for walks with her kids and her [fiancé] because she likes to keep moving when she’s not with him. She’s very adamant about making sure she’s active when he’s not around so she tries to get in 10,000 steps a day.”

Also a major component in Simpson’s ability to stay fit? Finding exercise that’s fun for her. “She likes walking in her neighborhood and people often see her doing that,” the source says. “She really enjoys the workouts. [Because] she loves it, she’s consistent. It’s the one constant in her life that she’s always done no matter whats happening.”

And — as Simpson’s svelte physique demonstrates — all that work is paying off. “There were pictures of her in Daisy Dukes the other day!” the source says. “She looks phenomenal.”

What do you think Simpson’s new slimmed-down style? Are you impressed by her results?

–Alex Apatoff, reporting by Raha Lewis

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