Jessica Simpson Pregnant: Songstress' Adorable Holiday Tweet with Daughter Maxwell Announces Second Baby [PHOTO]

Rumors have been swirling that Jessica Simpson is already pregnant with her second child with fiancé Eric Johnson - and the 32-year-old pop songstress recently sent out an adorable holiday tweet featuring her 8-month-old daughter Maxwell to confirm the happy baby news! The blonde bombshell and Weight Watchers spokeswoman hit up Twitter on Christmas day (Dec. 25), posting a Twitpic of little Maxwell playing in Hawaii next to the words "Big Sis" scrawled out in the soft, white sand. Guess that can only really mean one thing!

What an adorable way for Simpson to let her fans know that she's expecting again... little Maxwell steals the show with her cute candy-cane striped onesie and red bow, but it's the message in the sand that's the real big news:

@JessicaSimpson: "Merry Christmas from my family to yours!"

Reports confirm that Simpson (who lost a majority of the baby weight from her first pregnancy thanks to Weight Watchers) will not continue to diet while pregnant. Weight Watchers recently tweeted Simpson, congratulating her on the happy baby news - "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!"

Simpson and her fiancé of two years, former NFL player Eric Johnson, did not plan this second pregnancy - some critics even condemned the starlet for getting pregnant too quickly after giving birth to little Maxwell (on May 1, 2012). But Simpson and Johnson are apparently ecstatic over the baby news, and want to share the joyous occasion with their fans.

Congrats to the happy couple and daughter Maxwell, who seems delighted over the news that she's going to be a big sister soon!