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Nina Dobrev, Austin Stowell, Eli Mizrahi

Jennifer Cooper

Nina Dobrev and Austin Stowell are heating up!

The Vampire Diaries alum brought her boyfriend to Eli Mizrahi's intimate Founding Member launch dinner party at SKY Vault Penthouse Tuesday night where an eyewitness tells E! News that they looked very happy together, adding they "were in attendance and sitting close and acting really cute."

Stowell, 30 and Dobrev, 26, have been dating since the beginning of the summer and have been spotted packing on the PDA multiple times. And it looks like Tuesday night's Fashion Week party wasn't any different. "You can tell how much they love each other just by the way they speak and their mannerisms toward one another," our source adds. "Austin is such a gentleman and treats Nina with such respect."

Dobrev is a "big fan" of Founding Member, so she took her hunky boyfriend as her date to support Mizrahi and his new collection. Not only did she show her support by attending the event, she also wore his look to the party. She looked gorgeous in a white crop top that she paired with a blue blazer and matching pants. Stowell looked equally handsome in blue tailored suit.

Ahhh, the couple that matches together stays together!

The insider says Dobrev and Austin took "really cute photos together" with the #CookieSelfie boxes. What's a #CookieSelfie box, you ask? We'll tell you. Mizrahi had every guest's face printed onto a cookie so that each person could take a bite out of his/her face. In addition to snacking on themselves, guests, which included Bella Thorne, Shanina Shaik, Devon Windsor, Lorraine Schwartz and more, also sipped on cocktails provided by Hennessy VS throughout the evening.

Blogger Danielle Bernstein, Nascar driver Jeff Gordon and models Maryna Linchuk and Vita Sidorkina also celebrated with the fashion designer.