Every year, the Hopman Cup holds an annual gala on New Year's Eve. This year saw WTA and ATP players celebrating the start of 2019 in style together in Perth.

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Many major names attended the black-carpet event, including Serena Williams, Francis Tiafoe, Belinda Bencic, Roger Federer, Stefanos Tsitsipas, David Ferrer and Garbine Muguruza.

The Swiss defending champions stood out, with the former world No. 1 wearing a classic suit-and-tie while his partner wore a black one-shoulder dress.

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The exhibition style event includes teams from Germany, Great Britain, Greece, the U.S., Switzerland, Australia, Spain and France.

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Federer may have partied too hard, sending a funny New Year's Tweet to his fans while spinning on a rooftop.

In Perth, Germany currently leads Group A while Switzerland stands in first place in Group B. The finals between the winners of the two groups will take place on Saturday.