By jenny sundel
Updated Dec 22, 2014 @ 11:45 am
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Hailee Steinfeld officially turned 18 on December 11, but the actress kept the celebration going through this weekend with a blowout birthday soiree. Decked out in an all-black ensemble featuring a crop top, high-waisted pants, and her recently shorn locks, the brunette showed off her gold rings and nail flair on Twitter. "Black & Gold," she captioned of an up-close pic of her noir manicure featuring one striped nail.

In keeping with the color theme, gold mylar balloons spelled out her name. "WELL THAT WAS FUN…"she recapped on Twitter. "…and I've also never had balloons spell out my name before," she added.

On hand to join in the festivities: Sarah Hyland, who stuck out her tongue in a photo with Steinfeld, who planted a smooch on her cheek. The birthday girl copied the Modern Family star's Miley-inspired move in a shot with Austin Mahone, who rocked some blinged-out dollar-themed shades. "Straight MASTERPIECES," she said of the epic pic, which also included a pal in aviator goggles.

After a few more rounds of pics, she announced: "Okay so I'm 18. You get it. I get it."