This dress was the star of M&S's Christmas ad and now has £20 off

Marks & Spencer debuted its hotly-anticipated Christmas ad last month, and it didn't disappoint. In fact, it ended up being one of the most joyous ads we've seen this year. A feast for the eyes, it showcases everything M&S has to offer for the festive season, including standout partywear picks, gorgeous decorations, gifting and homeware.

Between baubles cascading down the stair, music blaring and lavish guests dancing, Marks & Spencer debuts its latest collection ready for Christmas, filled with everything from mini dresses dripping in sequins to sparkly blouses and classy stilettos.

In the ad, we get a glimpse of an entire range of stylish yet affordable partywear options, including the ultimate Christmas day dress — this V-Neck Frill Detail Midaxi Smock Dress. Designed in a gorgeous deep red, this floaty smock is ridiculously flattering with its long blouson sleeves, loose cut, and feminine details. Looking a lot more expensive than it actually is, it's the sort of dress you'll not just look great in, but feel great in, too. We're also obsessed with the way M&S has styled it, with a cropped faux fur jacket and knee-high boots.

And to top things off, it's just been added to M&S's sale, meaning you can snag the stylish dress for just £39 down from £59.

Marks & Spencer

V-Neck Frill Detail Midaxi Smock Dress

£39£59Save £20

This floaty midaxi smock dress from Marks & Spencer was featured in the brand's Christmas advert. 

£39 at Marks & Spencer

Shop Marks & Spencer's Christmas ad

Also featured and a silhouette that has proven popular this year is the elevated cardigan. In this case, a blouse-style top that comes fastened with oversized bows for a chic yet festive vibe. Available in sequin ivory and black, we picture this looking great with some wide leg trousers and heels.

While you could keep things simple this year with a little black dress, if you really want to turn heads, there's always the option of going for an all-over sequin, fringed number — like this show stopping Sequin Square Neck Mini Shift Dress, £79, that gets a fair amount of screen time in the ad (so will inevitably sell out fast).

We're suckers for a monochromatic look, and this all-red ensemble is absolutely stunning for Christmas. And you can buy the entire thing, including the tailored jacket, matching trousers, coordinating coat, and patent pointed pumps.

If sequins or bold colours aren't your thing, M&S also have you covered, with timeless shift dresses detailed with oversized bows, simple round necklines and short sleeves, great with a pair of tights and some block strappy heels for the evening.

10 more M&S partywear picks we're loving

Sequin Midaxi Pencil Skirt | £45

Sequin Pleat Front Wide Leg Trousers | £59

Disc Sequin Sleeveless Top | £35

Fringe Hem Mini Shift Dress | £45

Velvet Round Neck Midaxi Column Dress | £45

Mesh Jersey Animal Print Midi Column Dress | £35

Pure Cotton Embellished Cropped Cardigan | £65

Sequin Square Neck Mini Shift Dress | £49.50

Sparkly Cape | £69

Sparkly Wide Leg Trousers | £29.50