This is "fantastic for" them!
Kate Mara and her Fantastic Fourco-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!
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