A double baby moon! Back in December, a pregnant-again Jessica Simpson vacationed in Hawaii with fiance Eric Johnson, daughter Maxwell Drew, now 9 months, plus sister Ashlee and parents Tina and Joe -- and CaCee Cobb, her former personal assistant and longtime best friend. As it turns out, 32-year-old Simpson wasn't the only woman with a baby on board for the lush getaway.

PHOTOS: Pregnant bikini bodies

About a month and a half after marrying Scrubs' Donald Faison, Cobb, 31, announced her first-ever pregnancy on Thursday (Jan. 31). But in a newly revealed photo from the Hawaiian vacation, Cobb was already beginning to rock a baby bump.  (A bikini-clad Simpson tweeted a bare baby bump picture herself on Dec. 30.)

PHOTOS: Jessica Simpson's pregnancy

In a snapshot from Dec. 29, Cobb frolicked in the Pacific Ocean clad in sunglasses and a small black bikini that showcase her burgeoning belly. Cobb used Facebook to announce on Thursday that she and Faison, 38, were expecting "a little stormtrooper of our own!"

PHOTOS: Nude, pregnant celebs

For her part, Ashlee Simpson is also thrilled about her close pal's first-time pregnancy. "That's my other sister!" Simpson, 28, told Us Weekly at a bash in West Hollywood on Thursday.

This article originally appeared on Usmagazine.com: CaCee Cobb Pregnant, Debuts Baby Bump in Bikini