Kate Middleton and Queen Camilla broke a royal wedding etiquette with their outfits.

The Princess of Wales was on hand to celebrate the marriage of Peter Phillips and Harriet Sperling on June 6.

When it comes to fashion, Kate Middleton’s outfits are almost always impeccable… but a lot of people are truly up in arms ...

See what Prince William said to Kate Middleton as they met at the altar at Westminster Abbey on their wedding day on 29 April 2011 ...

While those born into royalty are prepared for the job from the start, those that marry into the royal family have some catching up to do. Of course, having a supportive partner makes the process ...

After a trying chapter, the Prince and Princess of Wales are moving forward more in sync than ever Chris Jackson/Getty; Neil Mockford/GC Images Kate Middleton and Prince William's royal romance is ...

Meanwhile, Prince Harry reportedly wasn't invited to the nuptials after he "lost touch" with his cousin ...

Add Yahoo as a preferred source to see more of our stories on Google. Prince William and Princess Kate on their wedding day in 2011. Before marrying a prince, royal brides have to learn how to act ...