Following the news of her ex-boyfriend's plans to marry Nikki, The Vampire Diaries star was "in great spirits" at the launch of the Nine Zero One Salon on Melrose Place in Los Angeles, according to E! News, which reported that the Vampire Diaries' star enjoyed a girls night out at the event.
Nina spent some time with her BFF Julianne Hough and close friend Zelda Williams while she was there, and was spotted making silly faces in the photo booth with Vanessa Lachey, Ashley Tisdale, Jennifer Morrison, her pal (and travel buddy) salon co-owner Riawna Capri and Nikki Lee.
"She seemed really happy," a source told the site. And she looked happy too, as she struck a pose with friends for photos in a one-shoulder, white, black and gold cocktail dress.
Although Nikki and Ian still haven't confirmed the engagement news themselves, their plans to marry were announced last week, just weeks after the Twilight star's divorce from her ex-husband Paul Mcdonald was finalized.
Nina and Ian, who used to go on double dates with Paul and Nikki when they were still together, called it quits in the summer of 2013.