This year the couple took their expanding brood to an outdoor activity park in Brugelette, Belgium – where they encountered a menagerie of small farm animals.
The three elder children, three-year-old Prince Emmanuel, Prince Gabriel, five - dressed in matching pink sweaters and faun shorts - and seven year-old Princess Elisabeth, got the giggles when they spotted a pot-bellied pig.
One-year-old Princess Eleonore – dressed in an identical version of her sister's pink flower-print top - wasn't so sure, though, watching the animal carefully from the safety of her 36-year-old mum's arms.
Meanwhile also enjoying some family time were Norwegian royals Crown Prince Haakon and Crown Princess Mette-Marit. The couple were at their summer house – which they've owned since last year – on Flatholmen island in Norway, to celebrate Haakon's 36th birthday.
The couple's youngest son, three-year-old Prince Sverre Magnus sent photographers into fits of laughter as he clambered over rocks and benches in a spot of improvised gymnastics. His 35-year-old mum managed to scoop him up though to pose for a snap with his siblings, Princess Alexandra, five and 12-year-old Marius Borg.