The 38-year-old shared a photo on Instagram at the weekend that showed her posing alongside proud 'uncles', Black Eyed Peas bandmates, will.i.am and apl.de.ap.
With her hands on her hips, Fergie showed off her burgeoning tummy in the pink and black bodycon dress, slipping into a pair of high heels in honour of the occasion.
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The expectant star appeared to share her second 'family' baby shower with a friend, and she took to social media to share photos of chocolate cakes and snapshots with loved ones at the intimate party.
It came two weeks after Fergie's star-studded official baby shower at Los Angeles SLS Hotel. Guests including Kelly Osbourne, Julianne Hough, Gabriel Aubrey, Adam Lambert and Lance Bass toasted the future arrival of Fergie's firstborn, a little boy due in September.
Fergie recently legally changed her name to take on that of her husband Josh Duhamel, who she married in January 2009.
"He sings and talks to my belly all the time," Fergie said of the father-to-be in a July interview. "He's very complimentary. I'm very lucky that he's really good to me."
"I can't imagine having a kid and then not being able to be there — that would just drive me crazy," Josh, 40, said in a previous interview with ET Canada. "We want to work it out so that we can be together; whether I am working, they can come with me or if she is working I can go with them.
"I can't see myself ever wanting to be away from my wife and kid."