The Hemsworth brothers – Chris, Liam and Luke – are widely regarded as some of Hollywood’s most genetically-blessed stars.

And it’s clear the apple doesn’t fall far from the tree.

Thor actor Chris, 37, left fans gobsmacked on Sunday when he shared photos of his youthful-looking mother Leonie to celebrate her 60th birthday.

‘Happy 60th to the greatest mum on earth! Love ya, mum,’ he wrote in the caption, prompting many fans to say that Leonie looks young enough to be his sister.

‘Are you kidding me? She is 60! No way. She seems to be younger sister. Oh my god,’ one baffled follower wrote.

‘She looks like your sister… happy birthday to her,’ another agreed.

A third confused fan wrote: ‘Wait, what?! She is 60? She looks so damn young!’ A fourth noted: ‘Clearly she passed on the good genes.’

In the photos, the mother-son duo posed together in colourful attire as they partied at Leonie’s tropical-themed birthday bash on Sunday.

Clad in a grey maxi dress and floral headband, Leonie could easily have passed for a woman celebrating her 30th birthday.

Chris’ wife, Elsa Pataky, revealed in May that a ‘strict’ intermittent-fasting diet was the secret behind Leonie’s age-defying appearance.

‘Intermittent fasting’ refers to an eating pattern that cycles between periods of voluntary fasting and eating, and is commonly used as a weight-loss strategy.

Speaking to Body + Soul, the Spanish actress explained: ‘The first person we knew who started [intermittent fasting] really strict was Chris’ mum, actually.’

‘She just looks amazing! She’s 60…and every year looks even better,’ she added.

Elsa explained that Leonie had started with one day of fasting per week, before gradually building up the frequency and length of her fasting periods.