Jessica Simpson flaunted her super-toned bikini body in a sexy two-piece bathing suit while on vacation with her family in Cabo San Lucas this week, Us Weekly reported. The entire Simpson clan jetted off for the trip to Mexico to celebrate mom Tina Simpson's 56th birthday on Monday.

The 35-year-old "Irresistible" singer showed off her figure and her cleavage with a deep green triangle halter bikini top paired with matching bottoms designed by U.K. swimwear designer Melissa Odabash, according to Us Weekly. The fashion entrepreneur accessorized her poolside look with a long, white robe cover-up, dark sunglasses, a straw hat and a floral print purse.

Jessica's husband, former NFL star Eric Johnson, also joined in on the family vacation, and the couple enjoyed a getaway without their children, 3-year-old Maxwell and 2-year-old Ace. Jessica's sister Ashlee Simpson and her husband Evan Ross also joined in on the trip, and they even brought along their daughter, 6-month-old Jagger Snow, according to Entertainment Tonight.

Mom Tina enjoyed spending time with her daughters and bonded with her son-in-laws, uploading photos with Johnson and Ross to her official Instagram page. In the caption for a sweet Polaroid shot of her and Ross, Tina wrote, "Blessed by the 2 best son in laws!!!"

Jessica has been able to keep her baby weight off, and she dished about her diet and exercise secrets to "Entertainment Tonight" during a red carpet interview at the YMA Fashion Scholarship Fund Gala in New York City earlier this month.

"I think being a mom is enough of a diet," Jessica said. "You have to run around chasing your kids, but I do eat a lot of their corn dogs so I have to get on the treadmill a lot to watch my TV shows."

See a snap of Jessica's bikini body and mom Tina's Instagram posts below.

 Son in law

A photo posted by Tina Simpson (@tinersimpson) on Jan 18, 2016 at 4:37pm PST

Blessed by the 2 best son in laws!!! A photo posted by Tina Simpson (@tinersimpson) on Jan 18, 2016 at 4:59pm PST