Hollywood actresses Lindsay Lohan and Keira Knightley will set screens alight when they film a steamy threesome for their new movie Best Time Of Our Lives, according to reports.

The film, about Welsh poet Dylan Thomas, will see Lohan portray Thomas' wife Caitlin MacNamara, while Knightley will star as the poet's childhood friend, Vera Phillips.

And lead actor Matthew Rhys has tantalised male fans by hinting at a "menage a trois" involving the two beauties.

He says, "There will be a bit of a menage a trois scene going on. I hope I'm up for it!"