Alicia Vikander has revealed she fell for Michael Fassbender when he put her nerves at ease when they were forced to stay a month in an isolated lighthouse for work.

The 27-year-old Swedish actress admits she felt ''terrified and very alone'' when she first arrived on the set of The Light Between Oceans, and says the 39-year-old Irish actor made her feel comfortable.

''He was very sweet at letting me in ... He was like, 'Can you please give me a note? What do you think I should do?' It was such a sweet thing to kind of let me in," Vikander told Vanity Fair.

Fassbender also lavished praise at the Ex Machina star saying she doesn't take anything for granted.

“With a lot of these actresses coming out, there’s this bravery that you don’t see so much in male actors... I noticed this as well with Lupita [Nyong’o] in 12 Years a Slave - this focus and understanding that there’s an opportunity given to you and you grab it… [Alicia] doesn’t mind taking a character she’s playing to an ugly place. Her level of commitment made me focus and make sure I was as committed.”

Michael previously revealed he and Alicia had instant chemistry the first time they met.

"When she arrived on the set, I could see the determination there and the focus, the hard work and then trying to keep it up all the time.

"She's a very good actor, disciplined...she works hard and gives great performances," he told The Sun on Sunday newspaper.

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The Light Between Oceans is based on the M.L. Stedman's psychological thriller of the same name, which was released in 2013.

The pair play a married couple, Tom and Isabel, who, after losing their own newborn baby, discover another child washed up in a boat near their home.

They decide to raise the little girl as their own, but when the girl's real mother, played by Rachel Weisz, crosses their path, they have a big decision to make.

The Light Between Oceans hits cinemas in January, 2017.