The ad, by Adjust Your Set, features model Lucy Bayet showcasing a glamorous range of M&S lingerie, which has been specifically designed for fuller-busted women.
Aiming to show that "style has no size", Bayet describes the importance of well-fitting lingerie in making her feel body confident, as she strolls through her whitewashed home.
Maria Koutsoudakis, head of brand and marketing for beauty and lingerie at the retailer, said: "In this campaign we want to celebrate the range for larger cup sizes – DD and above – and show that we understand that women want bras that are aspirational, beautiful and feminine as well as being comfortable and functional."
The ad is part of M&S’ wider ‘For the love of Lingerie drive, which Koutsoudakis said had "resonated well with our customers and is performing above our expectation".
Last month M&S launched a series of "back to school" TV ads on its social media channels.
The retailer placed three TV ads on its Facebook, Twitter and YouTube channels, alongside an exclusive online video called "Both getting picked". The campaign was promoted using the #everymilestone hashtag.