Elsa Pataky cuddles up to shirtless Chris Hemsworth

They've been married since late 2010, and share three young children together. 

And on Sunday, Spanish actress Elsa Pataky gushed over her husband, Chris Hemsworth, as she helped him celebrate his 34th birthday. 

Taking to Instagram, the Fast and the Furious star, 41, shared a shot of herself lifting shirtless Chris in her arms as they holidayed on the Great Barrier Reef, calling him her 'koala bear.'

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'Happy birthday to my koala bear!' Elsa Pataky cuddles up to shirtless husband Chris Hemsworth as they celebrate his 34th birthday

'Happy birthday to my koala bear!' Elsa Pataky cuddles up to shirtless husband Chris Hemsworth as they celebrate his 34th birthday

'Happy birthday to my koala bear!!,' Elsa's post began. 

'Best weekend ever! Love you always and forever!!,' she wrote, adding hashtags including 's**t I'm strong.'

She revealed the pair are staying with friends at Orpheus Island - a private Island which hosts up to just 28 guests a time.

Lapping it up! The blonde can be seen relaxing in a hammock on the beach and wearing a black one piece

Lapping it up! The blonde can be seen relaxing in a hammock on the beach and wearing a black one piece

Chilling out: In her Instagram story, Elsa shared a video of Chris drinking coconuts and eating on the beach with their friends

Chilling out: In her Instagram story, Elsa shared a video of Chris drinking coconuts and eating on the beach with their friends

Having fun: She also shared a shot of herself going snorkeling

Having fun: She also shared a shot of herself going snorkeling

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