"They fell in love, and have moved in together. Sasha was completely unknown. She's also become best friends with Riley Keough (another of the film's co-stars). Riley's been taking her to fashion shows in Paris. She is going to be a huge star," a source said.

Little is known about Sasha, whose Facebook page says she works as a hostess at chain restaurant On the Border Mexican Grill & Cantina in Texas and has been described as being "completely destitute" before being discovered by director Andrea Arnold and cast in 'American Honey'.

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LaBeouf's new romance comes after he and Goth, 22, had an explosive row in Tubingen, Germany, in July, when the actor was overheard saying he would've "killed" his partner.

The pair was filmed having an argument on the street and footage showed him telling locals he was afraid of what he might have done had he not walked away.