WATCH: Katy Perry releases magical Christmas song for H&M

Katy Perry has released a Christmas song as part of an advert for H&M.

The video features the singer dressed as a fairy who pops up saying ‘”Welcome, bienvenue… the makers of Happy and Merry cast their magic spell."

She’s then joined by dancing gingerbread men, presents, teddy bears and soldiers.

Watch the advert with the song ‘Every Day is a Holiday’ below.

In August she'd suggested she was writing a Christmas song but revealed no more details.

• Katy Perry
• The Buzz