The famous sisters flaunted their impressive style credentials while arriving at Barnes & Noble, where Nicky was holding a book signing for her brand new fashion guide 365 Style.
Keeping things chic and sophisticated for her evening, Nicky wowed in a gorgeous wrap-over black dress which was dotted with a cute red lips pattern and featured an elegant knee-length hemline.
The author let her frock do all the talking by opting for simple accessories, adding classic courts and a boxy black clutch, finishing with a slick of glossy red lipstick.
Meanwhile, Paris pulled out all the stops while supporting her little sister, sporting a sheer black gown covered in gold stars, featuring a plunging neckline for added va-va-voom.
The DJ toted all her evening essentials in her fave Chanel 2.55 quilted handbag, sweeping the front of her golden locks back into a quiff while tonging the lengths into soft waves.
And after spotting all the stunning outfits the sisters have been rocking at New York Fashion Week recently, we're desperate to get our mitts on Nicky's style book!
On Monday (8 September), Paris and Nicky looked totally adorable at the Dennis Basso show in matching pink and blue princess-style dresses, which they both teamed with nude heels.
The starlets also wowed while watching the Diane von Fürstenberg catwalk, flaunting their pins in coordinating electric blue frocks.
What we wouldn't give to have their wardrobes!
What do you think of Paris and Nicky's outfits? Let us know by commenting below as the best comment across the site each week wins £50!
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Paris' year so far in pictures:
Copyright: Jean Catuffe / Contributor