Little Miss Sunshine! Jessica Simpson was a bright spot on the red carpet at the John Varvatos Stuart House Benefit on Sunday, April 13, in West Hollywood, where she turned heads in a short, canary yellow dress by Yigal Azrouel.

PHOTOS: Jessica's body evolution

The sexy, slim-fitting frock showed off the 33-year-old Weight Watchers spokeswoman's super-fit figure and toned, muscular legs. She paired it with sky-high white platform Saint Laurent heels and simple silver jewelry.

PHOTOS: Jessica's family album

The mom of two (to daughter Maxwell, 22 months, and son Ace, 9 months) officially reached her post-baby weight-loss goal last month. To commemorate the milestone, she shared a photo of herself in a curve-hugging Alexander McQueen dress, writing: "First time rocking a white dress this year...but not the last! Thanks @weightwatchers!" She also posted a picture of herself wearing a simple white T-shirt, hashtagging it "#goalreached."

PHOTOS: Jessica's second pregnancy

The fashion mogul famously struggled to lose weight after her first pregnancy back in 2012, but she saw results pretty quickly after giving birth to Ace last June. "This body made two amazing little human beings. I love this body and what it's capable of -- no matter what size," she said in a Weight Watchers ad earlier this year. "But this version feels really good."

In another ad the next month, she added: "I have a newfound determination that I'm really proud of. I can honestly say I've never been happier."

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Jessica Simpson Stuns in Short, Sunny Yellow Dress, Shows Off Super-Fit Figure: Picture