Demi Lovato dons a thigh-skimming corset garment to resemble a very curvaceous Dorothy Gale

They performed Oscar-winning songs 74 years apart.

And on Saturday night Demi Lovato and Judy Garland were reunited in costume.

The singer made a very sexy Dorothy Gale as she dressed up for a Halloween party.

The singer shared some very busty selfies with her 49million Instagram followers as she squeezed into the iconic Wizard Of Oz wardrobe.

With smoky eye shadow, plenty of blush and a deep red lip, she looked a lot more grown up than the innocent 16-year-old Garland back in 1939.

Nevertheless she kept the blue ribboned pigtails to match the blue and white checkered dress to remain as faithful as possible, although the sheer lace trim across her cleavage was certainly a modern addition.

While neither Academy Award for Best Original Song belongs to them, Somewhere Over The Rainbow is as synonymous with Garland as Frozen’s Let It Go is with Lovato.

Leggy: The brunette beauty showed off her toned legs, covering them up with white fishnet stockings as she arrived at the private Halloween party in Beverly Hillsc

Blown away: The singer shared some very busty selfies with her 49million Instagram followers as she squeezed into the iconic Wizard Of Oz wardrobe

Mature: With smoky eye shadow, plenty of blush and a deep red lip, she looked a lot more grown up than the innocent 16-year-old Garland back in 1939

Dorothy of course is nothing without her squad; and it was Nick Jonas who backed her up on the night as the brainless Scarecrow.

Wearing an impressive straw-stuffed costume, the 24-year-old – perhaps in character – typed out the word ‘scarecrow’ on each of his Instagram stories, just in case anybody hadn’t figured it out.

The duo was also accompanied by a superb Cowardly Lion – complete with medal of bravery – although it wasn’t immediately clear who was behind the facepaint.

Squad goals: Dorothy of course is nothing without her squad; and it was Nick Jonas who backed her up on the night as the brainless Scarecrow

Both posted some scary clips of a haunted house they braved together.

Jonas and Lovato clearly aren’t sick of the sight of each other, despite completing a 47-date tour together just ten days ago.

Their double-header Future Now tour kicked off back in June, and saw them play dozens of shows in the US, Canada and Mexico, as well as a single show in Turkey.