The world's most famous socialite Paris Hilton, who's been busy enjoying the sights of the harbour city since her arrival earlier this week, shone on the purple carpet in a silver Rachel Gilbert number.
Hilton is in town with good friend - and rumored beau - DJ Afrojack, who provided a pumping soundtrack on the big night alongside party-rocker Redfoo from LMFAO.
Pop star Ashlee Simpson also made an appearance looking stunning in Roberto Cavalli.
But with famous sis Jessica Simpson just days away from giving birth, was she worried about missing the big event?
"I have plenty of time. And I'm going home (today) so it will be fine," she told the Daily Telegraph.
Speaking of Jess, her former hubby Nick Lachey and his gorgeous new wife Vanessa Minillo were also at the big bash!
The couple has been spotted out and about in Sydney this week enjoying a 'babymoon' ahead of the arrival of their first child later this year.
Singer Joe Jonas certainly scrubbed up well in a slick grey suit and hot pink shirt, after a few days spent playing tourist around Sydney.
'Step Up' starlet Sharni Vinson and 'Twilight' hunk Kellan Lutz made for a stunning pair, with the former 'Home and Away' babe obviously keen to soak up the atmosphere once inside!
"Horsing around @MarqueeSydney" she tweeted alongside this sweet snap.
And of course a whole host of local celebs were also on hand to enjoy the party!
Isabel Lucas, Abbie Cornish, Mel B, Jodi Gordon, Ricki-Lee Coulter and our very own Erin McNaught all walked the carpet before hitting up the brand new superclub, which features expansive views of Sydney Harbour and the city skyline.
The fun continues tonight, with Black Eyed Peas star will.i.am and hip hop icon Jermaine Dupri playing DJ sets as the club officially opens to the public.
Copyright : MTV Australia