'I don't think anything is cheesy about Christmas. More cheese is more Christmas." So says megastar Katy Perry, the new face of H&M's Holiday collection.
The top-earning woman in the music business is as famous for her chameleonic sense of style as she is for her stream of hit singles, and now she is lending her image and voice to the Swedish brand's festive campaign.
"It was fun to be able to shoot something so festive during the summertime - it was Christmas in July. It's made me more prepared for this Christmas than any Christmas," she said.
Perry first came to our attention as a mischievous mix of bubble-gum and burlesque with her flirty debut, I Kissed a Girl, in 2008. Since then, her unique style has evolved through candy-coloured hair, cupcake costumes and bras rigged with cans of whipped cream. But in recent years, she has ditched the cartoonish persona for a more sophisticated and high-glamour femme fatale look.
She has described her three key looks as "sporty behind closed doors, 1990s in the street, and couture on the carpet". "I'm Katy Perry on-stage. At home I'm Katheryn Hudson," she has said, referring to her birth name. "I've created this cartoon look when performing, but off-stage I don't always have three hours to put it together."
H&M was one of the places where Katy "first began cultivating my personal style" she has said. "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 cosy and cute, which H&M executes so well."
Her sprawling wardrobe, which she famously stored in a converted three-car garage in the Los Angeles home she shared with ex-husband Russell Brand, is filled with pieces by the likes of Chanel, Ashish and Moschino, whose creative director, Jeremy Scott, is one of her close friends.
Perry also fronted Moschino's Autumn/Winter 2015 campaign, and has described her love of Scott's designs by saying: "Everything has a sense of humour, and I just love that, because I never really take myself too seriously at all."
Perry's tongue-in-cheek approach to fashion makes her a perfect fit for a holiday collection, and she says Christmas is her favourite time of the year: "I love a theme! I had a really big party last year, where I had actual reindeer and my own Santa," she recalled. "There was a miniature gingerbread house with a mini Mrs Claus in it, and she was giving out warm gingerbread cookies to decorate."
H&M's Holiday collection also includes plenty of fun pieces; in the ads, the brunette beauty sidles up to a human-sized toy soldier and candy cane in an "Elfie Selfie" Christmas jumper and a T-shirt embellished with a giant red rhinestone bow.
There's no shortage of glam options for the festive season either, such as the bright red 1970s-inspired gown or the chic tuxedo jacket. Perry lists her own must-haves for party dressing as: "Glittery, of course. Velvet sometimes. I like a faux fur. I love the UK company Shrimps."
Of course, a Katy Perry look wouldn't be complete without a playful nod to the season: "I like putting an ornament in my hair - last year I had a little Christmas gnome. And I think red lipstick is super Christmassy. I wear a full tuxedo in one of the scenes in the commercial."
As well as bringing her signature peppy energy to the ads, Perry has also recorded an exclusive Christmas song with British DJ Duke Dumont to get you dancing around the Christmas tree. She was thrilled to release the Yuletide tune, saying that it's "every artist's dream to have their own Christmas song".
However, you won't find Perry performing it live - she will be too busy enjoying time with her family to promote the single over the holidays. Instead, she'll be taking a well-deserved break after a hectic year travelling some 80 cities on the Prismatic World Tour.
"No singing. I'm off for the rest of the year!" she has said. The festive season for Perry means an annual family trip with her parents, sister and niece.
" We're restarting our traditions now with the new additions in our family, and since they're so excited for Christmas, we become excited for Christmas. We'll be telling my niece Stella about Santa very soon."
But what do you get the girl who has everything? For this international pop phenomenon, time with her family is more than enough. "My family and I don't really exchange presents any more, we have little ones now that are sprouting up and they have their own Christmas.
"We usually go on vacation, and we spend most of our time eating and drinking a lot. That's pretty much it!"
On Christmas day, they "definitely do Bellinis," she said with a laugh, and spend the day playing board games - card game Apples to Apples is a favourite - and preparing dinner together. "We all make food together. My mother still does stockings, which is adorable - she still puts a toothbrush in my stocking and some extra socks. If we're in town, we like to go to the movie theatre. It's really not that fancy - it's cosy and onesies and sleeping in!"
So how would you sum up a Katy Perry Christmas? "Christmas means family time and loved ones and cosiness. Whatever makes you cosy is Christmas."
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Cara Delevingne for DKNY: Fashion's favourite It-girl knows a thing or two about clothes, so it's no surprise she wanted to try her hand at designing them too. The collection reflects the 22-year-old's androgynous street style with an array of jumpsuits, graphic tees and beanies.
Rita Ora for Adidas: While Ora's outrageous X-Factor looks are the subject of much chatter come Monday morning, her collaboration with Adidas is a touch more refined, featuring romantic floral prints and laid-back sportswear.
Amy Huberman for Bourbon: Since her first collaboration with the Monaghan footwear label in 2012, the Irish fashion icon's shoe ranges are frequent best-sellers. Each style is named after one of her favourite films, and features everything from everyday boots to party-ready stiletto heels.
Zooey Deschanel for Tommy Hilfiger: The New Girl star is famed for her girlish yet chic ensembles, and earlier this year crafted a nautical-inspired "To Tommy, From Zooey" capsule collection with the fashion house.
Rosie for Autograph: Marks & Spencer's lingerie department overhauled its image by recruiting supermodel Rosie Huntington-Whiteley to design a hugely successful range of luxurious lingerie sets and sleepwear.