The BFFs celebrated the Vampire Diaries star's Cosmopolitan cover at the magazine's Summer Bash at West Hollywood's Palihouse Hotel on Saturday in fab and flirty cocktail dresses.
Dobrev made a sunny style statement in a vibrant Julien Macdonald design with sexy sheer paneling that she paired with an Elie Saab clutch and ankle strap sandals, while her bestie kept things simple yet chic—perhaps to let her gal pal really shine on her big night?—in a little black dress with cutouts from Camilla and Marc's resort 2013 collection.
And to hear Dobrev tell it, the act of getting all dolled up for the party was in and of itself an A-list event!
No less than 30 of the 24-year-old's closest girlfriends headed to her house to get ready for glossy's glam event.
"We went to the hot tub, in the pool, we hung out all day and then we got ready," she told us exclusively. It's all about girl power!"
Talk about a pre-party!
Of course, we're not surprised to learn that Dobrev and her chums get ready together, seeing as not too long ago she seemed to coordinate her beachwear with Hough when the two recently hit the beach together in the same bikini.
And the stars' similar sense of style doesn't end there. Both turn to the same hairstylist to prep their hair for the red carpet.
"We've known the same person, Riawna Capri, who cuts and colors and does our hair," Hough exclusively told us. "She's like, 'You guys have to meet.' We've just been like joined—connected at the hip."
No wonder they make such a pretty pair!
Tune into E! News Monday at 7 p.m. and 11:30 p.m. for more from Nina Dobrev and Julianne Hough at the Cosmopolitan Summer Bash!