Nina Dobrev turned 27 on Saturday
Credit: Evan Agostini/Invision/AP

Nina Dobrev celebrated turning 27 with a smile.

The former Vampire Diaries star threw an emoji-themed bash for her birthday Saturday at Aventine Tattoria in Hollywood, owned by nightlife entrepreneurs and restauranteurs JT Torregiani and Sylvain Bitton.

The guest list included her boyfriend Austin Stowell and pals Nick Jonas, Chloe Bridges, Jessica Szohr, Kat Graham, Seth McFarland, Adam Devine, Chace Crawford and Julianne and Derek Hough.

“Nina and Julianne were breaking it down and dancing with each other,” a source tells PEOPLE of the actress and Dancing with the Stars judge.

The celebrities took the theme seriously, with the Hough siblings dressing as a cloud and snowman and everyone swinging at a custom emoji piñata on the patio.

“Nina and her boyfriend were super cute,” the source says of the birthday girl and Stowell, 31. “They were snapping pics on their phone and in the photo booth. They seem super happy together, and they have a really genuine connection. They kissed and held hands a few times, but he gave her her space and took a step back to watch her enjoy her special night with her closest friends.”