Jessica Simpson is lovin' the way she looks ... posting another bikini picture from her vacation in Cabo after she dropped 100 pounds for the 3rd time!
The "Open Book" author posted a mirror pic from what seems to be her hotel room in Cabo San Lucas Monday ... rocking a cheetah print 2-piece for the camera.
She's been living it up with her family in Mexico for spring break, posting photos with her husband Eric Johnson, and their children -- 9-year-old Maxwell, 8-year-old Ace, and 3-year-old Birdie Mae.
As you recall, Jessica revealed her drastic weight loss to her fans Friday ... posting another swimsuit pic and saying she has gained and lost 100 pounds three different times.
It sounds like this one is different because she adds, "I never thought this moment could or would happen" ... Jessica chalked it up to hard work, determination and self-love.
Jessica is now 41 years old, so it's got to be a lot harder to lose 100 pounds now than when she was younger and before her pregnancies.