St. Patrick's Day celebrations

Troops currently serving in Afghanistan commemorated Oates’ Memorial Day and celebrated a tea-total St Patrick’s Day.

Members of the Royal Dragoon Guards (RDG) join in with the St Patrick’s Day celebrations every year and soldiers and officers were presented with a shamrock today.

Here's a selection of images from the celebrations:

Read: More pictures from St Patrick's Day celebrations around the world

Canadian Astronaut, Commander Hadfield, sent this picture from the International Space Station.

Crowds of revellers have been celebrating the annual St Patrick's Day parade on the streets of Sydney, Australia.

Around 60,000 people were expected to take part in the city's celebrations of Australia's Irish heritage, according to local media reports.

Read: World landmarks turn green for St Patrick's Day

The Duke and Duchess of Cambridge braved showers to attend a St Patrick's Day parade at a military barracks today.

Wearing the same green Emilia Wickstead dress coat she wore to the event last year, Kate smiled broadly as she greeted soldiers from the 1st Battalion Irish Guards at Mons Barracks in Aldershot, Hampshire.

However, at one point, Kate's foot became stuck in a drain and she had to spend a few moments freeing her heel.

The Duke and Duchess of Cambridge are heading to Mons Barracks in Aldershot today for the annual St. Patrick's Day parade.

While visiting the 1st Battalion Irish Guards, Prince William will take part in the parade of 200 soldiers as colonel of the regiment.

Catherine will present the traditional sprigs of shamrocks to the officers and guardsmen - a tradition that dates back to 1901 and Queen Alexandra, the wife of King Edward VII.

The couple are expected to take a tour of the barracks including the Officers and Sergeants Mess during their visit.