The busty 32-year-old, who is holidaying in Hawaii with her family, posed in her hotel room wearing a low-cut kaftan which revealed her red string bikini top.
She also put her natural glow on show in full effect by wearing no make-up and completed the beach look with a hat.
'Fun in the sun!': Jessica Simpson tweeted this snap from her holiday in Hawaii on Thursday
Of course, Jessica has always been proud of her big bust, which is usually a DD cup.
When rumours surfaced in 2011 that she was planning to get a breast reduction, she immediately took to Twitter to set the record straight.
'I love my boobies,' she wrote. 'They aren't going anywhere.'
Sunrise stroll: Jessica and Eric Johnson enjoyed an early morning beach walk with their daughter Maxwell on Christmas Eve
Baby on board: The couple are expecting their second child
But she will remain the face of the company and they will continue to run ads promoting the blonde's 50lb weight loss, as well as pushing a new commercial in which she announces her pregnancy.
Praising her 'successful' weight loss, the company added: 'Jessica will not be following the programme during the pregnancy while her weight and well-being are monitored by her obstetrician.'
Family affair: The star later spent time with her mother Tina
Dad on duty: Eric enjoyed a stroll with Maxwell on Thursday
More the merrier:
Ashlee Simpson, her son Bronx Wentz, Tina Simpson, Eric Johnson and his
daughter Maxwell enjoyed some bonding time on Wednesday
Jessica is still in Hawaii after jetting off for a Christmas break with her NFL beau Eric Johnson and seven-month-old daughter Maxwell.Her extended family - including mother Tina, sister Ashlee Simpson and nephew Bronx - are also holidaying with them.
Her father Joe Simpson, who split from Tina earlier this year amid rumours he's gay, did not attend.
Deal still on: Jessica will continue to work
with Weight Watchers during and after her second pregnancy the diet
giants have confirmed