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It's a Baldwin family affair!  

Irealand, Hailey and Alaia Baldwin proved they're not only cousins, but also the best of friends at last night's "Mission: Impossible -- Rogue Nation" premiere in New York City.  

The raven haired beauty stunned in a black zip up midi dress and kept her hair swept off to the side.

Her 18-year-old model cousin also wore black, showing off her legs in an Elizabeth and James mini. She paired the look with lace-up Stuart Weitzman pumps and a red lip.  

And Hailey's sister Alaia, 22, added a pop of color in a pink mini dress, pairing the look with a slicked back hairstyle and nude pumps. Both Alaia and Hailey are Stephen's daughters. 

The trio looked gorgeous as they worked the red carpet to support Ireland's father, Alec Baldwin, who stars in the film.

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The 57-year-old actor brought wife Hilaria Baldwin along for the outing, who looked amazing less than two months after giving birth.  

The pair, who are parents to daughter Carmen, recently welcomed son Rafael back in June. The yoga instructor showed off her incredible post-baby bod in a white strapless dress as she cozied up to her hubby on the carpet!  

How gorgeous do the Baldwin ladies look? Sound off below then click "Launch Gallery" for more sexy celebrity offspring! 

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