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Rachel McAdams is dating her fourth costar, this time from True Detective

For Cailyn Cox, writing isn't just a hobby, it's her life. Passionate about Hollywood, she makes it her mission to find the most entertaining celebrity gossip for SheKnows readers. And when she's not enthralled in the celeb world, she's ...

Rachel McAdams has a thing for her costars, and she's dating a new one

It looks as though Rachel McAdams has a habit of dating her costars, because she is now rumored to be dating costar No. 4, and he's from True Detective.

More: True Detective Season 2 trailer shows a dark side of Rachel McAdams (VIDEO)

An insider told Us Weekly that McAdams is dating fellow Canadian Taylor Kitsch, saying, "It hasn't been long. But it's serious."

A second source told the publication that although the two have known each other for years, they took their friendship to the next level when "they grew closer on set."

More: Ryan Gosling and Rachel McAdams fought while filming The Notebook

So, could these two stars be in love?

"I don't know if it’s full-blown love yet, but they talk constantly," another source told the mag. "They're really into each other. She talks about him all the time!" Awww.

While we're thrilled at the possibility that McAdams and Kitsch could be dating, it's certainly not the first costar that the blond beauty has set her sights on. Some of her famous ex-boyfriends include Ryan Gosling (who could forget their incredible performances in The Notebook), Michael Sheen, who she starred with in Midnight in Paris, and Hollywood's favorite heartbreaker Jake Gyllenhaal, who starred opposite her in the 2015 boxing film Southpaw.

More: Do any of True Detective's Season 2 characters have potential? A ranking

A Us Weekly source had something to say on McAdams' relationship with Gyllenhaal, too, revealing that "she definitely dated Jake Gyllenhaal while filming Southpaw."

So, if the reports are true, we'd love to know what you think: Would Rachel McAdams and Taylor Kitsch make an awesome couple?

Rachel McAdams has a thing for her costars, and she's dating a new one

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