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Hey, Upper East Siders: We've got a hot tip concerning a certain Blake Lively. After rocking seven different pantsuits in seven days to promote A Simple Favor (with a nod to her character from the film), the actress took a short hiatus (some QT with hubby Ryan Reynolds, perhaps?). Lively then stepped out again to debut five more pantsuits, all more gorgeous and jaw-dropping than the last. Here, the biggest trend for fall courtesy of Serena Van Der Woodsen The Rhythm Section actress. XOXO, Gossip Girl. 

blake lively grey pantsuit
Marc Piasecki/Getty Images

Lively's Chanel pantsuit is proof that pinstripes (and mandarin collars) are back, people.

blake lively teal pantsuit
Pascal Le Segretain/Getty Images

Note to self: Replace a traditional tie with a long, thin scarf for a more laid-back upgrade.

blake lively pink pantsuit
Dave J. Hogan/Getty Images

Bury us in this custom Ralph Lauren Collection wide-leg suit, pretty (in pink) please.

blake lively navy pantsuit
James Devaney/Getty Images

Rock a tailored suit buttoned over a bralette for the perfect daytime-to-date-night ensemble.

blake lively gucci pantsuit
Media Punch/Getty Images

OK, so yours doesn't have to be a $4,200 Gucci pantsuit. But if Lively's trendsetting is any indication, we'll all be wearing pantsuits 'til spring—and we couldn't be more excited.

RELATED: Blake Lively Wore an Unexpectedly See-Through Shirt & Lived to Tell the Tale

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