Chris Hemsworth posed for pictures with a couple on their wedding day - but the bride had no idea who he was.

Chris Hemsworth

Chris Hemsworth

The 'Thor: Ragnarok' actor was surfing in Byron Bay with wife Elsa Pataky and their children, four-year-old daughter India and two-year-old twin sons Sasha and Tristan last Friday (03.03.17) when he was spotted by newlyweds Anneka and Kent's best man, and happily agreed to be in their photos.

However, Anneka admitted she had no idea why they were posing with a "random person" until her new husband filled her in.

She said: "It was Chris Hemsworth on the beach and [the best man] was like, 'Hey, do you think you could get a photo with the bride and groom?' And he said, 'No worries.

"I was wondering, 'Why we were getting a photo with a random person?' I was saying, 'Who is this person?'" she said.

"[Kent] was getting embarrassed that I kept asking who this person was and he said, 'Chris Hemsworth.'"

But despite her confusion, the "laid back" star impressed the bride - even if she does think her husband was more taken by the hunky actor than his new wife.

She joked to news.com.au: "He was pretty cool, calm and collected and he seemed pretty laid back.

"Our wedding photos will now be one of three people instead of one of two. [Kent's] favourite wedding photo is the one with Chris Hemsworth."