Jessica Simpson Debuts Baby Bump In A Bikini

Access Hollywood
Jessica Simpson shows off her baby bump on December 30, 2012 -- Twitter

Jessica Simpson is daring to bare her baby bump -- and she's doing it in a bikini!

"Bumpin' and Proud!" the 32-year-old star wrote on Twitter on Sunday, posting a photo of herself in a two-piece bathing suit and a floral print wrap.

PLAY IT NOW: The Top Transformations Of 2012

The star, her family and friends have been enjoying a holiday vacation in Hawaii this week.

Little sister Ashlee Simpson was spotted with son Bronx and newlywed pals CaCee Cobb and Donald Faison enjoying the beach on Saturday.

VIEW THE PHOTOS: Hollywood’s Hottest Moms & Their Loveable Little Ones

(See Ashlee showing off her bikini body, HERE!)

Jessica's latest Twitter post comes days after her Christmas Tweet of a photo of her 8-month-old daughter Maxwell with the words "Big Sis" scrawled in the sand - her first confirmation of her second pregnancy with fiance Eric Johnson.

As previously reported on, the star is putting her Weight Watchers plan on a temporary hold during her pregnancy.

VIEW THE PHOTOS: Celebrity Baby Bumps

"It's wonderful news and we couldn't be happier for Jessica, Eric [Johnson] and big sister-to-be Maxwell," Cheryl Callan, Senior Vice President of Marketing at Weight Watchers, said in a statement earlier this week. "[She] will not be following the program during the pregnancy while her weight and well-being is monitored by her obstetrician, as is recommended for any woman during pregnancy. After she gives birth, Simpson and her doctor will decide when she should resume following the Weight Watchers program."

-- Jesse Spero

VIEW THE PHOTOS: Celebrity Siblings

Copyright 2012 by NBC Universal, Inc. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.