Jessica Simpson gives a glimpse of her bikini body

On Sunday she celebrated her 42nd birthday.

And Jessica Simpson shared a glimpse of her bikini body as she posted a series of snaps documenting her final family vacation on her big day.

The singer wowed in a red swimsuit in photos taken from her July 4 trip to Lake Austin, Texas.

fun in the sun! Jessica Simpson shared a glimpse of her bikini body as she posted a series of snaps documenting her recent family vacation on her birthday

In the photos, Jessica showed off her toned legs as she stepped out on the boat in a red bikini.

She pulled her blonde hair back with a striped hair tie and wore large white sunglasses.

The slideshow captured all the fun her family had during the fun-filled day on the water.

Whether the family was hanging out on the boat together or enjoying a range of water sports, there was something for everyone on the day.

Life is good!  Simpson sat back as she enjoyed a day on the water with her husband Eric Johnson and their three children

Life is good! Simpson sat back as she enjoyed a day on the water with her husband Eric Johnson and their three children

Mom in love!  Simpson beamed with joy as she hung out with daughter Maxwell and son Ace

Mom in love! Simpson beamed with joy as she hung out with daughter Maxwell and son Ace

Jessica shared a photo of herself on a jet ski, while another action-packed image showed someone on a raft.

“Life at the lake,” Jessica commented on the snaps.

Jessica shares her three children – daughters Maxwell, 10, Birdie Mae, three, and son Ace, nine – with husband Eric Johnson.

In April, the Open Book author announced that she had gained and lost 100 pounds three times in her life, following her three pregnancies with Maxwell, Ace and Birdie Mae.

family fun!

family fun! “Life at the lake,” Jessica commented on the snaps

Make a splash!  Simpson threw her arm in the air as the boat took off

Make a splash! Simpson threw her arm in the air as the boat took off

At the time, the star attributed her slimmer physique to a lot of “hard work, determination and self-love,” while sharing a photo of herself in a bikini.

Her 5.8 million Instagram followers left hundreds of supportive comments, and many other moms called her an “inspiration” and praised her transparency.

“Amazing performance – not just the weight but the confidence. love to see! And you look great!’ One fan wrote in the comments section, while another: “You look amazing!”

Siblings: Jessica shares her three children - daughters Maxwell, 10, Birdie Mae, three, and son Ace, nine - with her husband Eric Johnson

Siblings: Jessica shares her three children – daughters Maxwell, 10, Birdie Mae, three, and son Ace, nine – with her husband Eric Johnson

Awww!  Simpson posted a snap of her husband loving their daughter

Awww! Simpson posted a snap of her husband loving their daughter

In her memoir Open Book, Jessica said she underwent two tummy tucks in 2015 but ended up in the hospital for nine days after contracting an infection after the second procedure.

“I wanted to get rid of the stretch marks and sagging skin that were left over from my back-to-back pregnancies,” she said in her book. “I was so ashamed of my body at this point that I wouldn’t let Eric see me without a white t-shirt.”

She continued: “But the second procedure led to complications: “I got an infection – colitis – and was throwing up so much I thought I was going to tear my stitches. … The doctors have seriously discussed my needing a blood transfusion.”

To smile!  The trio grinned as they enjoyed a day on the water

To smile! The trio grinned as they enjoyed a day on the water

Action packed!  Simpson piloted a jet ski through the lake

Action packed! Simpson piloted a jet ski through the lake

Despite having surgery, Jessica refuses to get botox to look young.

The musician uses red light therapy to “tighten” her skin and says she doesn’t want to start cosmetic procedures like botox injections because she doesn’t want to risk losing her “expression” on her face.

When asked about her beauty routine, the singer said: “I really got into red light therapy. I fell down a rabbit hole at this amazing esthetician and I was like, ‘okay I need something to tighten my skin, I’ve just turned 40. I don’t want to get botox, I like my facial expression. That’s what makes me I am.”‘

obliterate!  One of the action-packed images showed someone on a raft

obliterate! One of the action-packed images showed someone on a raft

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