Katy Perry is to star in H&M's Christmas campaign.

The 'Roar' hitmaker has revealed she's been signed up to appear in adverts for the high-street brand's latest collection of festive clothing.

Alongside an image from the campaign of her pulling a snowflake patterned woolly jumper up over her mouth and nose, Katy wrote: ''Ladies, Gentlemen & unlabeled-

let's take a petite pause on the beauteous summer we are experiencing & open our calendars tooooo..THE HOLIDAYSI am excited to announce that I will be starringin @hm's #HappyandMerry Holiday Campaign launching later this year!!! Stay tuned for the whole unwrapping! Tap for credits! (can't believe I already have holiday emojis in my most recently used emoji's...more shame) (sic).''

The brunette beauty - whose hair is pulled back into a neat bun with a fitting red bow tied around it in the snap - also admitted she's been shopping in H&M for years.

In a statement released on Thursday (16.07.15) she said: ''H&M was one of the places where I first began cultivating my personal style. I have continued to love integrating H&M pieces into my wardrobe throughout the years. One of the reasons I love the holidays is being able to dress cozy and cute, which H&M executes so well for every budget.''

The last celebrity to endorse the campaign was Lady GaGa and Tony Bennett in 2014.