The couple, who were first spotted together in Byron Bay in September, just as rumours started circulating the actor was thinking of moving to Australia, celebrated Zac's birthday over the weekend.
The Baywatch actor's 33rd birthday bash took place on Sunday and saw guests including Chris and Liam Hemsworth's dad Craig, tennis pro Pat Rafter, radio host Kyle Sandilands and The Voice Australia host Renée Bargh, in attendance.
In photos obtained by The Daily Mail, Zac wore white jeans, a navy shirt and flip flops, and arrived with Vanessa, who was wearing an LBD paired with a long orange shirt.
A source tells People: "Zac and Vanessa are very happy. They celebrated Zac's birthday with friends before the weekend.
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