Jessica Simpson posed for a photo with her girlfriends while on vacation this weekend. She is one sexy lady–and her ripped legs are to die for.

Showing off her black one-piece swimsuit, and having fun with friends Lauren Harrison and Stephanie Pearson, Jessica Simpson mugged for the camera. And while her face is gorgeous and the rest of her body enviable, it’s those legs that everyone is likely talking about.

The mom of two–who celebrated her 35th birthday on Friday–shared the shot via Instagram.

“I love these vacation babes @laurenz422 @stepheniepearson,” she captioned the photo.

A photo posted by Jessica Simpson (@jessicasimpson) on Jul 11, 2015 at 1:41pm PDT

So exactly how did Jessica Simpson get her ripped legs?

People magazine first reported on her gams back in December.

At that time, Jessica Simpson talked about her Weight Watchers diet and workouts with noted celebrity trainer Harley Pasternak.

Happy 35th birthday, Jessica Simpson! http://t.co/0qdICJjE7t pic.twitter.com/bfHVZaiuwz

— Us Weekly (@usweekly) July 10, 2015

“We usually alternate between doing quads one day and hamstrings and glutes or butt the next, and then inner thighs,” one of Pasternak’s trainers told the magazine this spring.

The trainer was working with Jessica Simpson for 45 minutes per day, four to five days per week at that time.

Her new photo shows what a few months of hard work can do.

Kudos to Jessica Simpson for having some of the best-looking legs around. Women everywhere are surely dying to know how they can achieve Jessica Simpson’s sexy look.