Pregnant Fergie asserted her fashionista credentials at Vienna's Life Ball, sporting a baby bump to boot.
Attending the charity fundraising event, the Black Eyed Peas singer took inspiration from her band name and wore a sophisticated all-black ensemble.
Oozing glamour at the A-list event – also attended by Elton John, Heidi Klum, Naomi Campbell, Hilary Swank and ex-president of the United States Bill Clinton – Fergie wowed in a high-necked, ruched satin dress.
The star, whose real name is Stacey Ferguson, completed the look with a studded black clutch and pointed black heels. Adding a devilish element to her outfit, the singer opted for a swift flick of cat-like eyeliner and vampish red lips.
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Fergie, 38, found friend Kelly Osbourne among the throng of guests at the Arabian Nights themed event. Media personality Kelly wore a vibrant gold gown to the bash and styled her locks into a funky violet up-do.
Chatting animatedly to one another, the pair were obviously thrilled to be in each other's company.
"So glad u made it!!! ahhh vienna!!!!!" the Big Girls Don't Cry star wrote her friend on Twitter.
The songstress, who is more than halfway through her pregnancy, later showed off her burgeoning bump when she changed into an all-white gown during the AIDS fundraiser, the waistband of her dress resting below her growing tummy.
The Glamorous singer, 38, will be expecting her first child with husband Josh Duhamel in the autumn.
"We're thrilled," Fergie said. "When that moment occurs to you, there's going to be a human being growing inside of you... it's reality. It's amazing; we're thrilled."
When asked about her parenting technique, the singer admitted that she didn't have a game plan.
"I have no idea what I'm doing. I'm just going to play it by ear and see how things go, and let the natural instincts kick in."