“Fantastic Four” co-stars Kate Mara and Jamie Bell engaged

This is “fantastic for” them!

Kate Mara and her “Fantastic Four” co-star, Jamie Bell, are engaged, Mara’s rep confirms to ET.

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Over the weekend, the 33-year-old actress tweeted a photo of herself donning a ring on that finger, causing the engagement speculation to go into overdrive.

The couple has been dating since late 2015, shortly after filming their superhero movie.

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Congratulations to the happy couple!