In the UK, Tamara Ecclestone was spotted leaving a London nightclub looking merry in a glittery hat alongside her mum Slavica.
Meanwhile Tom Daley posted a pre-party snap in skinny jeans and a bow tie, looking very dashing.
Across, the pond Taylor Swift was busy performing to crowds in Times Square, alongside Psy and Carly Rae Jepsen. Elsewhere in the US, parents-to-be Kim Kardashian and Kanye West attended the New Year's Eve Party in Las Vegas.
Away from the celebrations, The Dark Knight Rises star Gary Oldman looked busy in Beverly Hills.
See all the celebrity celebrations and more in our gallery below: