The women of the royal family have made huge contributions to its success.

In honor of International Women's Day, here are the different ways Queen Elizabeth II, Kate Middleton and (soon-to-be royal) Meghan Markle rule their family, as per E! News.

1. They are fierce and not afraid to get their hands dirty.

Queen Elizabeth II joined the Auxilliary Territorial Services when she was just 19. She became a trained driver and mechanic with the rank of Second Subaltern. She was promoted to Junior Commander after a few months.

As a monarch, Her Majesty reigns with courage and dedication. In fact, former Prime Minister Harold Macmillan described Queen Elizabeth II as someone with "the heart and stomach of a man."

2. They give voice to the people

Princess Diana became the people's princess because she supported several causes to help the public. For instance, she opened the UK's first HIV/AIDS unit and even shook hands with a patient suffering from the disease without gloves to show the world that it could not be transmitted through touch.

3. They are not afraid to tackle taboos

There were stigmas surrounding HIV/AIDS and leprosy, but the late Princess of Wales was not afraid to cover this. In fact, she talked about her postnatal depression openly. Middleton also shares her personal struggles and experiences to encourage people to speak up for their mental wellness.

4. They champion different causes and charities

The Duchess of Cambridge is an advocate for mental health. She also promotes maternal mental health to help women suffering from postpartum depression.

Meanwhile, the future royal, Markle, is focusing on women's rights and gender equality. In fact, when she attended the first annual Royal Foundation forum she talked about this concern.

5. They are not afraid of change

Change is the only constant thing in the world and the female royals are not afraid of this. "Change has become a constant, managing it has become an expanding discipline," Queen Elizabeth II said.

Following Markle's royal engagement to Prince Harry, she also announced that she would quit acting. The "Horrible Bosses" star's career is at its peak, but she's not afraid of the change that awaits her for being a royal.

"I don't see it as giving anything up. I just see it as a change," Markle told BBC about quitting "Suits."