New Couple Alert? Tom Hiddleston and Elizabeth Olsen Reportedly 'Hooking Up'

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Sorry Tom Hiddleston fan girls -- looks like the much-loved actor is getting cozy with Avengers star Elizabeth Olsen.

According to Us Weekly, the 34-year-old Thor actor and the 26-year-old younger sister of the Olsen twins have been "hooking up."

"It's casual," an insider tells the magazine. " ... But they do make sure to text when they're apart."

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The pair reportedly got close while playing husband and wife in their upcoming biopic, I Saw The Light, in which Hiddleston plays singer-songwriter Hank Williams. They also, of course, have the Marvel connection -- the British actor plays Loki in the Avengers and Thor films, while Elizabeth made her debut as the Scarlet Witch in Avengers: Age of Ultron.

Olsen called off her engagement to actor Boyd Holbrook in January.

"She wants to make a new life for herself," the source says. "She's having fun."

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Check out ET's Avengers: Age of Ultron exclusive on-set visit with Chris Hemsworth and Robert Downey Jr. in the video below!