Pregnant Jessica Simpson makeup-free and beaming in Hawaii

Pregnancy obviously agrees with Jessica Simpson.

A day after her coy Christmas confirmation that 7-month-old Maxwell Drew is going to be a big sister, the fashionista tweeted a gorgeous picture of herself and fiancé Eric Johnson on the beach in Hawaii.

"Aloha," writes the hot mama, showing off a radiant smile and a glowing, makeup-free complexion in the couple's self-portrait.

Jess, sporting a straw cowboy hat and cover-up, was also snapped by paparazzi strolling hand-in-hand on the beach with Johnson, concealing her baby bump with the denim shirt she is wearing in her Twitter pic.

Weight Watchers confirmed their spokeswoman will not be following their program during her pregnancy, "while her weight and well-being are monitored by her obstetrician" -- and judging by her happy and healthy appearance, her doctor must approve!