Cressida Bonas is "scared" of Prince Harry's Ex-girlfriend Chelsy Davy, a source of Now magazine reveals.

The 24-year-old dancer is not really afraid of marrying into the royal household, the source adds, but that Bonas is "worried" that the prince drops everything if Chelsy "decides to click her fingers".

In a letter sent by Prince Harry to one of his friends in 2004, it is revealed how the royal is in love with Davy, saying Chelsy is "the love of my life."

The source also says that Harry is still "besotted" with Davy.

Chelsy Davy was Prince Harry's on-again, off-again girlfriend. He confirmed that she is his girlfriend on his 21st birthday but the two briefly split by the year 2007.

Their "turbulent" relationship ended to another break up in 2009. Chelsy Davy started dating cricket player Graeme Smith afterward her break up with the prince. Prince Harry and Chelsy reunited months later but finally broke it off for good in 2010.

In November of 2011, Prince Harry said he is "100 per cent single."

Despite Cressida Bonas's fears, friends of the royal reportedly told the aristocrat to keep calm if she really wants to marry her prince.

In July 2013, Prince Harry reportedly took to the dance floor with Davy right in front of current girlfriend Cressida Bonas during a society wedding they attended. Davy was the maid of honour and Bonas was the prince's plus one.

Reports say that Prince Harry and Chelsy Davy danced to Rihanna's Only Girl (In The World) long dubbed as their song.

Cressida Bonas's father told pals at the time that Harry "will break his daughter's heart", according to Now.

When Davy returned to London in May 2013 for her legal training, rumours that she and her ex-boyfriend have reconnected hit the newsstands. An insider says that Davy "always had Harry wrapped around her little finger."

Bonas was reportedly "in floods of tears" when she heard the news about Davy being back in London, says the source.