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Serena Williams has hailed the Duchess of Cambridge 'one heck of a woman' following her appearance outside the Lindo Wing just hours after giving birth.

The tennis star, 36, said she thought the royal had given birth 'maybe two days before' after seeing the photographs of Kate looking immaculate with her new baby. 

Serena said she was definitely 'not in heels' following the birth of her own baby daughter, Alexis Olympia, in September.

The mother-of-one has previously shared details about her own traumatic birth, revealing how she 'almost died' due to complications.