Giuliana Rancic in bathing suit with husband Bill Rancic playing with new baby Edward Duke in Hawaii on vacation March 7, 2013. Credit: Splash News

Three's company! Giuliana Rancic and husband Bill spent some quality time together in Hawaii on Thursday, March 7 -- with their latest addition to the family, baby Edward Duke, in tow.

The 6-month-old cutie giggled and smiled at mom, 37, as the E! News host bounced the tiny tot in the clear Pacific waters. Rancic wore a black one-piece halter suit and aviator shades, flaunting her enviable figure and long legs as she soaked in the sun.

"In Hawaii for family vacay :) Back Tuesday :)," she tweeted at a fan who asked about the host's whereabouts.

Edward, who was born via gestational surrogate on Aug. 29 of last year, wore a tiny blue shirt and patterned swim trunks for his brief dip in the ocean.

The host recently called Edward the "cutest baby ever," and told Us Weekly how she and Bill, 41, are planning to be the best parents they can be for their little boy.

"We're husband and wife, but we're also best friends, and it's funny because a lot of people, when they have kids, they put the baby first, and the marriage second," she told Us at a Toast to Red Carpet Style event on Feb. 26. "That works for some people. For us, I find, we put our marriage first and our child second, because the best thing we can do for him is have a strong marriage."

The couple, who have been very public about their struggles with infertility (the pair tried IVF numerous times, and Rancic was diagnosed with breast cancer in October 2011), are even contemplating having a second child.

"We'd love to do it, so hopefully it's sooner rather than later," she told Us.