Kate Middleton Steps out in Cloud-Coloured Dress for African Wildlife Documentary Premiere [SLIDESHOW]

Catherine (Kate Middleton), the Duchess of Cambridge has wowed fashionistas yet again. The Duchess attended the British premiere of the nature documentary "African Cats" at the British Film Institute on Southbank, along with Prince William, on Wednesday.

The screening was held to raise funds for the UK-based animal welfare organisation, Trust Tusk, which raises funds for various animal conservation works across Africa. The royal couple was the guest of honour at the premiere since Prince William is the Royal Patron of the organisation

Always a head turner, Kate decided to pay obeisance to the weather gods this time around and wore a light grey dress - a hue reminiscent of the clouds and weather during rains. As it happened, it turned out to be a perfect choice of colours for it was indeed a rainy day. Her husband, the Prince Charming, was spotted escorting the Duchess with a judiciously held umbrella.

The Duchess chose a three-quarter sleeve sheath dress, designed by Welshman Matthew Williamson, embellished with a jade and turquoise trim around the collar and cuffs. She finished her ensemble with black stilettos and no accessories.

The end result - she was undoubtedly the top draw at the event.

Incidentally, the event was the first public appearance for the royal couple after Prince William returned from his overseas posting as a Royal Air Force (RAF) helicopter search-and-rescue pilot stationed in the Falkland Islands.

"It's really that integration that has drawn Prince William as our patron. It's something that he believes passionately in, and tonight's premiere of 'African Cats' just gives us an opportunity to communicate that onto the global stage," the organisation's Chief Executive Charlie Mayhew said in a statement.

There is, however, one other reason why Africa is dear to William, as is "African Cats" itself. The film was made in Kenya, which was where the Prince proposed to Kate, in November 2010.

Directed by Keith Scholey, who also directed "Big Cat Diary" and Alastair Fothergill of "Earth," and "Deep Blue", the film was shot in Kenya's Masai Mara region from August 2008 to October 2010. The documentary is based on lions and a family of cheetahs in the savanna. British actor Sir Patrick Stewart has narrated the documentary.

Browse through the slideshow to view pictures of Kate Middleton and Prince William at the premiere