Duchess Kate Middleton's sparkly tiara and elegant dress may have lit up the internet on Friday night but the crown for the biggest viral hit from the royal wedding goes to Princess Beatrice's hat.

Wedding guests were obliged to wear fancy headware for the occasion and the internet wasted no time poking fun at the hats worn by Princesses Beatrice and Eugenie. Princess Beatrice's hat has hundreds of photoshopped images, a Tumblr page and more than a dozen Facebook pages dedicated to it, the most popular of which has over 116,000 "likes".

The popular meme is reminiscent of the internet storm caused by the oversized hat worn by Aretha Franklin at US President Barack Obama's inauguration. But Princess Beatrice's isn't the only hat to have caused a stir on the web.

Kate Middleton's sister Pippa wasn't wearing a cringe-worthy hat but she still captured the hearts and minds of the internet the moment she arrived for the wedding.