Whether you’re holding a street party or simply tuning in on the box come Royal Wedding day, you can get into the regal mood with OPI’s Cool Britannia Royal Collection. My favourite shade is this sweet and shimmering pink called Princesses Rule. It looks pretty on any length nails and can be used all summer long to give nails a perfectly polished look. The other shades are navy blue Dating A Royal, pink Royal Blush Flush and dramatic burgundy Royal Rajah Ruby.