Katherine McNamara & Bianca Santos Bring 'Happyland' to Teen Vogue's Young Hollywood Party!

Katherine McNamara works the red carpet in a little black dress at the 2014 Teen Vogue Young Hollywood Party with Emporio Armani on Friday night (September 26) in Beverly Hills, Calif.

The 18-year-old Happyland actress was joined by her co-star Bianca Santos and The Fosters actor Jake T. Austin at the big bash.

PHOTOS: Check out the latest pics of Katherine McNamara

FYI: Katherine is wearing a Claire Farwell dress and Bcbgeneration shoes. Bianca is wearing Armani.

10+ pictures inside of the Happyland stars and Jake T. Austin at the party…