After helping design Sydney's 12-minute, rainbow themed fireworks show, Hugh Jackman watched it unfold with friends.
The Hollywood star and his wife Deborra-lee Furness also hung out with Lisa Wilkinson.
On the other side of the world, pregnant Khloe Kardashian told her fans this was her "Final glam of 2017!"
Demi Lovato also celebrated the New Year by sharing a sexy selfie.
Mariah Carey was glittering as always.
As were Sophie Monk and Stu Laundy who partied with her BFF Oscar Gordon.
America's first daughter went for a much more formal look for her NYE portrait with hubby Jared Kushner and their kids.
True to form, Australia's newest Bachelor couple sealed the deal with a kiss.
Sydney Swans legend Barry Hall and former Hi-5 singer Lauren Brant enjoyed their first New Year's as parents with the new mum reflecting, "I achieved my greatest creation - my son Miller".
Family Feud's Grant Denyer was "being out partied by 2 year olds" who were jumping on a bed while decked out in festival-worthy glow sticks.
Andy Lee and partner Rebecca Harding watched the New Year tick over together.
Eddie was up bright and early to start 2018 by hosting Sunrise's New Year's Day coverage.
Jessica Rowe was living every homebody's dream with a puzzle and PJs.
Also keeping it pretty chill, Jesinta Franklin posted this pic of her AFL star hubby with the caption, "@buddy_franklin23 Trying to stay up for the 9PM fireworks"
Glamour model and Geoffrey Edelsten's ex wife Gabi Grecko celebrated by stripping down.
So did Anthony Callea (to a lesser extent) after he spent NYE soaking up the last of 2017's rays.
After a long holiday with her boyfriend, Bindi Irwin was thinking of her family on NYE and posted this pic.
On the other side of the globe, Lara Worthington was in Aspen, USA, teaching her first son Rocket to snowboard.