Jessica Simpson showed off the results of her Weight Watchers diet plan at the John Varvatos 11th Annual Stuart House Benefit in Los Angeles on Sunday.

All eyes were on the mother of two, who wore a form-fitting yellow dress, as she posed on the red carpet.

She posted a photo of herself on Instagram, writing “So HAPPY to support @johnvarvatos for the #StuartHouse.”

image via Instagram from Jessica Simpson

Simpson told reporters of her daughter, Maxwell, 1, "My daughter [Maxwell] wasn't ready for a red carpet today. So that wasn't going to happen yet, but maybe next year,” E! Online reports.

Simpson, 33, was named spokeswoman of Weight Watchers after she gave birth to Maxwell but she took a break when she announced her surprise second pregnancy. After giving birth to Ace Knute, 10 months, she’s back on the plan and has lost a reported 60 pounds.

Simpson got engaged to Eric Johnson in 2010 and the two are planning to tie the knot sometime this year.