Watch the Trailer for Blake Lively's Movie A Simple Favor

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If you're one of Blake Lively's 20 million Instagram followers, you may have noticed that she wiped her entire account clean yesterday. (Spoiler alert: It was in promotion of her new movie, A Simple Favor.) Today, Lively resurfaced on Instagram to post the trailer for the new thriller film, which also stars Anna Kendrick as Lively's best friend.

As it turns out, Kendrick doesn't know Lively as much as she thinks she does—setting the scene for an intriguing mystery plot. Plus, if you pay attention to Lively's outfits, you'll notice a life-imitating-art moment: Her character wears a blazer, a button-down blouse, and a bow tie, just like Lively herself recently wore on the red carpet—and the outfit definitely has Gossip Girl vibes written all over it. Scroll down to watch the first teaser trailer for A Simple Favor, which comes out in theaters on September 14.

Opening Image: Nancy Rivera/Bauer-Griffin/GC Images

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Erin got her start as a Who What Wear intern in 2011—back when the site only published a single story per day. (We have since increased that number twentyfold.) She graduated magna cum laude from USC and lives in Los Angeles. In college, she also interned at Refinery29, where she was promoted to editorial assistant and then assistant editor. After nearly three years at R29, she came back to WWW in 2015, where she is now the Associate Director of Fashion News. From the Oscars to the Met Gala, she leads the site's entire red carpet coverage strategy. She specializes in celebrity and fashion news but also enjoys writing travel features and runway reports. She frequently contributes to WWW's social accounts and has a sizable following on her personal TikTok.