Katherine McNamara heads back to the 1990s with her 19th birthday party held at Siren Studios Penthouse in Hollywood on Saturday night (November 15).

The 18-year-old Happyland actress will turn 19 next week and invited all her celeb friends to celebrate early!

“The besties! Thanks so much for surprising me and making tonight so special! @NintendoAmerica #FlashbackBirthdayBash,” Kat wrote after the event.

Katherine‘s Happyland co-stars Bianca Santos, Ryan Rottman and Camille Guaty, Sarah Hyland, Nolan Gould, Joel Courtney and more were on hand to help her celebrate.

Stay tuned for even more pics!

20+ pics inside of Katherine McNamara

Photos: Startraksphoto

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