This awe-inspiring video shows a great-gran celebrating her 100th birthday by belting out a dazzling rendition of 'When You're Smiling'.

Sprightly Letitia 'Letty' Lancaster was commemorating her big day surrounded by adoring friends and family when she suddenly burst in song.

The heartwarming moment was captured by her quick-thinking granddaughter-in-law Vicky Lancaster, who pulled out her phone straight away.

Widower Mrs Lancaster, wearing a sash and a tiara, can be seen tapping her foot and bouncing up and down as she chants the iconic lyrics at her care home in Castle Douglas, Dumfries and Galloway.

Widower Mrs Lancaster, wearing a sash and a tiara, can be seen tapping her foot and bouncing up and down

As the 60 second clip comes to an end the room erupts in cheers and applause.

Mrs Lancaster, described as a "natural performer", spent many of her younger years singing and dancing and continues to entertain residents at the care home she lives to this day.

She said: "Performing has always been a part of my life and it keeps me happy.

"No matter how old I am or where I am I will always sing."

Mrs Lancaster, affectionately known as Letty by loved ones, was born in South Shields, a coastal town in the North East of England, on January 27, 1920.

The family moved to Scotland in 1989, where Mrs Lancaster lives in a nursing home today, before her husband George Lancaster's death in 2010.

One of eight children, with four brothers and three sisters, she was taught how to sing and dance from a very young age along with all her siblings.

Letitia 'Letty' Lancaster (L) as a youngster

Her mum was an original member of the Tiller Girls, which was one of the most popular dance troupes of the 1890s.

Mrs Lancaster, whose favourite musician is Dutch violinist and conductor André Rieu, performed professionally in her 20s as well as making records with her siblings.

She married George in 1947 and the two lived together in Cheadle Staffs, where they had son Paul in 1952.

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Letitia 'Letty' Lancaster and her husband George Lancaster

The family later moved to Blackpool, Lancs, where they were a big part of the variety performance scene, playing at Blackpool Grand Theatre and the Opera House.

Mrs Lancaster performed as a soloist and a duet with her sisters in the 1930s and on one occasion had auditions alongside famous singer Vera Lynn.

She later performed on variety chat show Des O'Connor Tonight in the 1980s alongside her musical husband George, or 'Elly' as she affectionately called him,