They battled over the love of Prince Charles, but now Camilla has been spotted wearing Princess Diana's wedding present from the Queen Mother.
In 1981 when Diana married Charles, the Queen Mother gave her a stunning diamond brooch to mark the occasion.
Throughout her life Diana was seen wearing the precious "Prince of Wales Feathers brooch", often styling it as a necklace.
The brooch is a family heirloom, which has been passed down from Queen Alexandra to Queen Mary and then to the Queen Mother.
The brooch features 18 diamonds in an oval shape, which are set with tiny emerald diamonds.
Three glistening diamond ostrich feathers sit in the middle of the brooch and it's finished off with a handing emerald.
After Diana's death in 1997, the brooch was returned to the Queen where she kept it safe until Charles married Camilla, the Duchess of Cornwall, in 2004.
It is believed Charles was adamant that she was to have it after they married.
Camilla was first seen wearing the piece at a movie premiere a year after she married Charles.
A picture from the day was also used for the Charles' and Camilla's Christmas Card.
The Daily Mail stated at the time: "It is understood that the Prince was particularly keen for his new bride to wear the brooch because of its association with successive princes of Wales."
Though it appears Camilla will one day have to return the brooch.
It's thought that the Prince of Wales feather brooch will be passed down to the Duchess of Cambridge when she eventually becomes the Princess of Wales.