By DAILY MAIL REPORTER
Jessica SImpson confirmed she's pregnant for the second time with a sweet tweet on Christmas morning.
The 32-year-old, who is engaged to Eric Johnson, posted a picture of her seven-month-old daughter Maxwell sitting in garden with the words 'BIG SIS' scrawled in the sand.
She wrote alongside the snap: 'Merry Christmas from my family to yours!'
Jessica confirmed her first pregnancy with a similarly playful post - she dressed as an ancient mummy for Halloween in October 2011 and wrote: 'It's true, I'm going to be a mummy!'
The announcement ends weeks of pregnancy rumours surrounding the star, who had just lost 50lbs with Weight Watchers as part of a $4million deal.
Her Expect Amazing commercial, which is officially released on TV today, showed her flaunting her lean post baby body on the back of a pick-up truck.
Weight Watchers congractulated Jessica on her baby news via a tweet which read: 'Congrats to @JessicaSimpson, Eric and big-sister-to-be Maxwell! Your WW family is so thrilled for you. What an amazing year you've had!'
Jessica was last pictured attending her best friend Cacee Cobb's wedding to Scrubs star beau Donald Faison in Los Angeles on December 15.
She wore a black bridesmaid dress and had a bouquet on hand to strategically cover her bump.