Martha Stewart has revealed what she thinks of the Duchess of Sussex’s lifestyle brand, saying: “I hope she knows what she’s talking about”.

Stewart, the lifestyle guru and self-made billionaire, said it was important to be “knowledgeable about your subject matter” in what appeared to be a veiled swipe the Duchess.

The Duchess has recently launched a range of lifestyle products including fruit spreads, edible flowers, honey, crepe mix and wine under her As Ever wellness brand.

She has also released a lifestyle programme on Netflix titled With Love, Meghan, which will air its second series in the autumn.