Terrifying ordeal for Crown Princess Mary after her youngest daughter Princess Josephine, four, is injured in a horse riding accident at their summer palace in Denmark

  • Princess Joesphine pictured wearing a cast and hospital wrist band
  • Four-year-old was riding at summer residence Gråsten Palace on Sunday
  • Parents Crown Prince Frederik and Princess Mary pictured horse riding 
  • Princess Josephine is fifth in line to the throne 

Crown Princess Mary's daughter, Princess Josephine, has reportedly been injured while out horse riding with her family in Denmark.

Pictures of the four-year-old with a cast and hospital wrist band emerged on social media on Wednesday.

A 'royal watch' Twitter account posted the picture with the caption: 'Little Princess Josephine broke her arm in a riding lesson on Sunday. She was seen with a cast following the fall.' 

Crown Princess Mary's youngest daughter, Princess Josephine (pictured in April), is believed to have broken her arm during a horse riding accident on Sunday

Crown Princess Mary's youngest daughter, Princess Josephine (pictured in April), is believed to have broken her arm during a horse riding accident on Sunday

The four-year-old (seen during a skiing holiday in Verbier in February) was pictured on social media with her arm in a cast and wearing a hospital band

The four-year-old (seen during a skiing holiday in Verbier in February) was pictured on social media with her arm in a cast and wearing a hospital band

Crown Princess Mary and Crown Prince Frederik (pictured in 2007) are keen horse riders, and are often pictured out riding during the summer

Crown Princess Mary and Crown Prince Frederik (pictured in 2007) are keen horse riders, and are often pictured out riding during the summer

The accident appears to have occurred nearby Crown Prince Frederik and Crown Princess Mary's summer residence, Gråsten Palace.

Princess Josephine is seen clutching her injured arm in the picture, which is cradled in a sling that looks to have been signed with 'get well' messages.

Pictures also emerged on the Twitter account, Royalty Speaking, of the royal couple heading out for a horse ride without their four children.

The accident is reported to have occurred near the royal family's summer residence Gråsten Palace

The accident is reported to have occurred near the royal family's summer residence Gråsten Palace

Princess Josephine (far left) is fifth in line to the throne, behind her twin brother Prince Vincent (third right), sister Princess Isabella (third left), older brother Prince Christian (second right), and father Frederik (far right)

Princess Josephine (far left) is fifth in line to the throne, behind her twin brother Prince Vincent (third right), sister Princess Isabella (third left), older brother Prince Christian (second right), and father Frederik (far right)

The princess - full name Josephine Sophia Ivalo Mathilda - is youngest of the Frederik and Mary's children, after twin brother Prince Vincent who is 26 minutes older.

She is fifth in line to the throne.

The twins have two older siblings, Prince Christian, nine, and Princess Isabella, eight.

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