Inside Kate Middleton and Meghan Markle's budding friendship

Kate Middleton and Meghan Markle are set to become sisters-in-law when Markle and Prince Harry tie the knot in May. 

But according to People, the two have already started leaning on each other. 

SEE ALSO: Elton John knew Prince Harry was in love before he proposed to Meghan Markle

A source close to the former "Suits" star says Meghan is "funny and serious and extremely hard-working" and that Kate will find a great friend in her. 

The two, despite both being 36 years old, experienced different upbringings and their roads to royalty have been quite different. 

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Meghan Markle's first royal Christmas
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Meghan Markle's first royal Christmas
KING'S LYNN, ENGLAND - DECEMBER 25: Meghan Markle attends Christmas Day Church service at Church of St Mary Magdalene on December 25, 2017 in King's Lynn, England. (Photo by Chris Jackson/Getty Images)
US actress and fiancee of Britain's Prince Harry Meghan Markle (L) curtseys as Britain's Prince Harry (R) bows as they see off Britain's Queen Elizabeth II leaving after the Royal Family's traditional Christmas Day church service at St Mary Magdalene Church in Sandringham, Norfolk, eastern England, on December 25, 2017. / AFP PHOTO / Adrian DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
US actress and fiancee of Britain's Prince Harry Meghan Markle (2R) and Britain's Catherine, Duchess of Cambridge, (L) curtsey flanked by Britain's Prince William, Duke of Cambridge (2L), and Britain's Prince Harry (2R) who bow as they see off Britain's Queen Elizabeth II leaving after the Royal Family's traditional Christmas Day church service at St Mary Magdalene Church in Sandringham, Norfolk, eastern England, on December 25, 2017. / AFP PHOTO / Adrian DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
Britain's Catherine, Duchess of Cambridge, (L) and Britain's Prince William, Duke of Cambridge, (2L), US actress and fiancee of Britain's Prince Harry Meghan Markle (2R) and Britain's Prince Harry (R) stand together as they wait to see off Britain's Queen Elizabeth II after attending the Royal Family's traditional Christmas Day church service at St Mary Magdalene Church in Sandringham, Norfolk, eastern England, on December 25, 2017. / AFP PHOTO / Adrian DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
(Left-right front) Lady Louise Windsor, the Duke of Edinburgh, (left-right centre) The Duke and Duchess of Cambridge, Meghan Markle and Prince Harry arriving to attend the Christmas Day morning church service at St Mary Magdalene Church in Sandringham, Norfolk. (Photo by Joe Giddens/PA Images via Getty Images)
KING'S LYNN, ENGLAND - DECEMBER 25: Meghan Markle and Prince Harry attend Christmas Day Church service at Church of St Mary Magdalene on December 25, 2017 in King's Lynn, England. (Photo by Chris Jackson/Getty Images)
KING'S LYNN, ENGLAND - DECEMBER 25: Meghan Markle attends Christmas Day Church service at Church of St Mary Magdalene on December 25, 2017 in King's Lynn, England. (Photo by Chris Jackson/Getty Images)
Britain's Prince Philip, the Duke of Edinburgh, leads members of the royal family as they arrive to attend the Christmas Day church service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay TPX IMAGES OF THE DAY
Britain's Prince Harry and his fiancee Meghan Markle leave St Mary Magdalene's church after the Royal Family's Christmas Day service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
Britain's Prince Harry and his fiancee Meghan Markle leave St Mary Magdalene's church after the Royal Family's Christmas Day service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
Britain's Queen Elizabeth leaves St Mary Magdalene's church after the Royal Family's Christmas Day service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
Britain's Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge leave St Mary Magdalene's church after the Royal Family's Christmas Day service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
Britain's Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge, Meghan Markle and Prince Harry leave St Mary Magdalene's church after the Royal Family's Christmas Day service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
Britain's Catherine, Duchess of Cambridge leaves St Mary Magdalene's church after the Royal Family's Christmas Day service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
Meghan Markle arrives at St Mary Magdalene's church for the Royal Family's Christmas Day service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
Britain's Prince Charles and Prince Andrew lead members of the royal family as they arrive to attend the Christmas Day church service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
Britain's Catherine, Duchess of Cambridge, Prince Harry and Meghan Markle arrive at St Mary Magdalene's church for the Royal Family's Christmas Day service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
Britain's Prince William and Catherine, Duchess of Cambridge arrive at St Mary Magdalene's church for the Royal Family's Christmas Day service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
Britain's Prince Harry and his fiancee Meghan Markle arrive at St Mary Magdalene's church for the Royal Family's Christmas Day service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
Britain's Prince William, Catherine, Duchess of Cambridge, Prince Harry and Meghan Markle arrive at St Mary Magdalene's church for the Royal Family's Christmas Day service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
Britain's Catherine, Duchess of Cambridge and Meghan Markle arrive at St Mary Magdalene's church for the Royal Family's Christmas Day service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
Britain's Prince Philip, the Duke of Edinburgh, leads members of the royal family as they arrive to attend the Christmas Day church service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
Britain's Prince William, Catherine, Duchess of Cambridge, Prince Harry and Meghan Markle arrive at St Mary Magdalene's church for the Royal Family's Christmas Day service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
Britain's Prince Harry and his fiancee Meghan Markle arrive at St Mary Magdalene's church for the Royal Family's Christmas Day service on the Sandringham estate in eastern England, Britain, December 25, 2017. REUTERS/Hannah McKay
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Kate met William at St. Andrews University when she was 19 years old, while Meghan enjoyed an established career as an actress and has even been through a divorce, back in 2013. 

And their relationship is already being compared to Princess Diana and Sarah, Duchess of York -- also known as Fergie -- who got along famously well when they married royals around the same time.

Diana married Prince Charles, while Fergie married Prince Andrew.

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