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Jessica Simpson is continuing to proudly show off the results of her impressive 100lb weight loss after sharing a revealing new snap to her Instagram on Thursday.

The 42-year-old mother-of-three, who is currently vacationing in Mexico with her husband Eric Johnson, wowed her fans in a brown two-piece after admitting earlier this year that she once thought her bikini days were behind her.

‘Without 3 kids needing me to hurry, I had the time to accessorize the bikini,’ she wrote to her 6.1million followers, adding: ‘It is the little things that make me happy.’

Impressive: Jessica Simpson continues to show off 100lbs weight loss in a two-piece on vacation in Mexico… after previously thinking she would ‘never’ wear a bikini again 

Earlier this year, Jessica wrote in a candid post that she ‘never’ thought she would be able to show off her figure after yo-yo dieting over the years.

‘I have gained and lost 100lbs 3x, so I never thought this moment could or would happen, but I’m finally spring breakin’wearin’ a BIKINI!!!!!!,’ she wrote.

The singer added: ‘Hard work, Determination, Self Love. I enjoyed a good proud cry today.’

Just hanging out in her hotel: The siren also posted this image to her Insta Stories plugging the platform heels which matched her suit

Jessica, who celebrated turning 42 this July, recently shared a love letter to herself to mark her birthday.

She wrote: ‘Oh lil Mrs 42 look at you leanin’ into the moonbeams to recharge and radiate a purposeful glowing heart.

‘I am very proud of my faith, resilience and strength over the last 4 decades.

Incredible:Simpson, 42, wowed in a cut-out swimsuit as she said ‘adios’ to her ‘romantic’ getaway with her ‘forever love’ and husband Eric Johnson on Thursday

‘Everything in my life that has or hasn’t happened yet makes turning 42 very exciting because I know what it takes personally to remain inside of DETERMINED PATIENCE.

‘I know myself and I do love her very much.’

‘I know my purpose and I must say that ladies and gents I am equipped to waltz within every dream I own confidently. I am humbled and honored to finally be my own best friend. Ok 42 time to Rock ‘n’ Roll.’

Weight loss journey: Jessica has been open about her weight with fans (Pictured left in 2006, and right in 2012 when she was pregnant with her first child) 

The Employee of the Month actress also shared a look at her birthday party, posting photos with friends and family, including her husband Eric Johnson and parents Tina and Joe Simpson.

They included a shot of Simpson blowing out a sparkler candle on a birthday cake.

She posted about a gift from her nine-year-old son, Ace, who gave her a robot costume made from cardboard boxes and a note that said: “Best mom ever in the world. I love you so much.’

Journey: Simpson became a Weight Watchers spokeswoman after the birth of her daughter Maxwell in May 2012 (Pictured above in 2013)

Simpson, who has daughters Maxwell, 10, and Birdie Mae, three, with Johnson as well as Ace, also showed off her bikini body in posts about a Fourth of July break to Lake Austin, Texas.

She said: ‘We asked the kids where they wanted to go for their summer trip and out of everywhere, they chose Texas to be with their cousins.

‘It was a sentimental and nostalgic blast of a week.’

Roll with it: It comes as Jessica revealed she has taken up roller-skating again as it makes her feel young, she said in a recent interview

Throwback: The siren wore short shorts beautifully in her 2005 film The Dukes Of Hazzard