Eric Johnson and Jessica Simpson in Oahu, Hawaii on December 26, 2012. Credit: FameFlynet

Life's a beach for second-time mom-to-be Jessica Simpson!

On Wednesday, Dec. 26 -- one day after confirming her pregnancy with a Twitter photo of daughter Maxwell Drew sitting in the sand next to the words "Big Sis" -- the 32-year-old Fashion Star mentor stepped out with fiance Eric Johnson in Hawaii. Showing off her lean legs in a short, colored caftan, the singer held a denim shirt in front of her belly to conceal any signs of a baby bump as she strolled hand-in-hand along the surf with her football player beau, 33.

As Us Weekly exclusively revealed in November, the couple are expecting their second child together, less than eight months after welcoming baby Maxwell into the world. Simpson had been tight-lipped about the pregnancy -- which "definitely wasn't planned," a pal told Us -- but she broke her silence this week, first on Twitter and then in a newly released Weight Watchers ad.

"This year is all about new beginnings for me," the star says in the commercial. "I lost over 50 pounds on Weight Watchers and did not have to be perfect to do it. Being healthy has become a part of who I am...which is great timing, because I'm having another baby."

And even though the little bundle-of-joy was a surprise, "I feel like I'm on top of the world," she gushes.