Colin Farrell [Photo/Agencies]

Celebrities at Hollywood Foreign Press Association's annual luncheon

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The 37-year-old actor appears in the film alongside former 'Downton Abbey' star Jessica Brown Findlay, who plays his love interest, and admits the romantic drama won't be a favourite for everybody since it's "too sweet".

He told HELLO! magazine: "It's not for everyone. I know that for some people it will be too sweet. But it's also a very beautiful and very optimistic and very kindly intentioned film that has not a shard of malice in it, and I'm hoping that the people who will enjoy it, will really enjoy it."

Farrell's equestrian skills made it easier to film scenes where he rode Athansor, a mysterious white horse who becomes his alter-ego's guardian angel, but had concerns about having Findlay on the horse behind him.

He added: "That was a hairy ride, man. People can get thrown off horses, you know? And I don't mind for myself because I've been thrown off horses before, and it's fine, it's cool, you just get back on again. I don't even mind how wild the horse is - although the horse we used in the film was pretty cool and mellow. But I did fear riding with Jessica in the back because I'm not that good a horseman."