Queen Camilla's actions were caught on camera during a royal engagement alongside the Swedish royals at Windsor Castle. Her cheeky move came as the couple were planting a Swedish oak tree, gifted by the visiting royals.

The 77-year-old Queen was filmed tapping King Charles on the bottom twice in an apparent attempt to move him along during their tree planting ceremony, while he was busy chatting away.

Camilla tried to interrupt the conversation between Charles and the Swedish King Carl XVI Gustaf. She tapped the monarch, turned away, and then tapped him again to regain his attention.

GB News reported a fan on social media had noted the interaction. The royal fan commented on X: "Camilla patting the royal tush." The Queen's gesture highlighted the strong relationship between the couple as they carried out their official duties.

The Swedish Oak was a gift from the Scandinavian sovereign to celebrate the British royals' Coronation on May, 6, 2023, two years on Tuesday. Quercus robur, to use its Latin name, is taking up residence in Home Park on the Windsor Estate.

It has come from the Royal Nursery at Sollidan Palace, the Swedish Royal Family's summer residence, and will be twinned with a Swedish oak which will be planted at the Royal Djurgarden in Stockholm.

The two Kings used spades to plant the tree and the Queens were given a watering can each to finish off the job.

Queen Silvia, 80, joined her husband for the ceremonial tree planting, continuing the long tradition of royal diplomacy through such symbolic acts.

Tree planting, ribbon cutting and plaque unveiling are considered staple duties of ceremonial royal roles in both countries.

Both Sweden and the the UK are governed by constitutional monarchies. The visit came the day after King Carl XVI Gustaf celebrated his 79th birthday on April 30 with a traditional military celebration at the Royal Palace in Stockholm.

The Swedish monarch is the longest-reigning king in Swedish history. He became King in 1973 at the young age of 27. He will mark the 52nd anniversary of his accession on September 15 this year.