Katy Perry travelled back to the 50s for her latest birthday.

The Roar singer turned 32 on October 25 and threw a Sock Hop-style bash this weekend to mark her big day.

She named the venue of her party Hudson High (in a nod to her real surname of Hudson), and dressed as a 50s headmistress, with a name tag reading ‘Principal Hudson’.

Katy shared some photos on social media. She captioned one image on Instagram: “Thanks @COVERGIRL for keeping everyone clean-cut and QT at Hudson High, Home of the Poodles, Principal Hudson. #KatyxCOVERGIRL.”

Other photos have also appeared online.

Guests included actress Cara Delevingne and Kate Hudson, who shared some photos of the group.

Entertainment apparently included a performance from a marching band and a giant game of Twister.

Looks like a lot of fun!