Meghan Markle's best friend slams 'racist bullies' abusing the Duchess of Sussex

Meghan Markle's close friend has joined the throngs of celebrities fighting back against the critics 'bullying' the Duke and Duchess of Sussex.

Jessica Mulroney, a 39-year-old Canadian stylist and one of Markle's best friends, has taken to social media to slam the constant abuse aimed at the Duchess of Sussex. 

"Three years of undeserved hate and abuse. It's enough," Mulroney wrote on her Instagram.

The statement accompanied a post addressed to Markle's critics. 

"When someone faces unfair criticism, you call it out. When that person is your friend and your family, you call those critics what they truly are. Shame on you, you racist bullies," said the image, shared to Mulroney's 330,000 followers on Wednesday.

Mulroney also shared a tweet from British actress Jameela Jamil, who claimed England's brutal treatment of Markle is race-related.

"Dear England and English press, just say you hate her because she's black, and him for marrying a black woman and be done with it," Jamil wrote on Wednesday.

"Your bullying is so embarrassing and obvious. You've all lost your marbles. It's 2019. Grow up."

Jamil also addressed the recent backlash against the royal couple's "hypocritical" use of a private jet twice in one week. She defended the controversial choice, saying civilians become easily endangered when in proximity with power. 

"It's not safe for us to be on the same planes as royals or presidents, you absolute muppets," she lashed out.

"They are prime targets for kidnap and sometimes assassination. It's in the interest of us civilians to not be endangered by proximity to people in such powerful positions."

A number of high-profile names have rallied on social media to defend Markle and Prince Harry, including Elton John, talk-show host Ellen DeGeneres and pop singer Pink.

"Portia [de Rossi, DeGeneres' wife] and I met Prince Harry and Meghan in England to talk about their work on wildlife conservation. They were the most down-to-earth, compassionate people," DeGeneres wrote on Twitter.

"Imagine being attacked for everything you do, when all you're trying to do is make the world better."

Pink slammed royal critics for "the most public form of bullying", urging people to be kinder to one another.

The private jet backlash against the Sussexes predominantly focused on the couple's promotion of environmentalism, with UK Labour MP Teresa Pearse telling The Sun that the royal duo should be leading by example.

In July, Prince Harry declared the couple would only have two children out of concern for the planet.