The Game Night actress, 39, was on hand to promote her new film, Disobedience, at the Tribeca Film Festival in NYC. She wore a sheer Giambattista Valli dress, which was detailed with ruffles, floral embellishments and a deep V-neckline.
McAdams was joined by her costar Rachel Weisz at the event. Weisz announced earlier this month that she is expecting her first child with husband Daniel Craig. (She already shares son Henry, 11, with ex-fiancé Darren Aronofsky and Craig is dad of Ella, 25, from his previous marriage to Fiona Loudon.)
The couple began dating in 2016 following McAdams’ split from Taylor Kitsch. She also has previously dated Ryan Gosling and Michael Sheen while he was linked to New Girl’s Zooey Deschanel for two years.
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