Since their marriage in 2011, Prince William and Princess Catherine have been inseparable. They've embarked on numerous tours around the world, in addition to extensive charity work in the United Kingdom.

June 4 is a big day for one royal family member. It's Princess Lilibet's fourth birthday. The youngest of Meghan Markle and Prince Harry's children (and the youngest grandchild to King Charles) hit a milestone today.

When one a friend of the Princess of Wales told her that she was lucky to have Prince William, she seemingly had a seriously confident five-word comeback, that put the pal in their place