It happens every. Single. Year.

And Ariana Grande kicked off the tradition at the Jingle Bell Ball on Friday night, when she performed in a festive two-piece.

The pop superstar showed off her perfect pins and toned tum in a pair of sparkly red knicker shorts and matching bralet.

The brunette stunner added a pair of festive furry cuffs to her show ensemble, and a wore a pair of pretty white patent heels.

Ariana wore her hair in her statement half up-half down style, and kept her make-up glam for the event.

The pint-sized pop princess was joined on stage by Brit BFF Jessie J and boyfriend Big Sean.

Under the mistletoe? (Image: Gellery)

Shake it Off hitmaker Taylor Swift showed off her festive style in a chic gold sparkly skirt, which she teamed with a black strapless top and chunky court shoes.

The stunning singer looked tanned and toned as she posed for snaps on the red carpet, before changing into a sparkly crop top and matching skirt for her performance later in the night.

Rapper-of-the-moment Iggy Azalea opted for a classic black midi dress to walk the red carpet.

The Aussie hitmaker showed off her flawless hourglass figure in the skintight number, which she teamed with a chunky gold necklace and a pair of black and white checked court shoes.

The Fancy singer changed into a pair of blue chinos and a see-through mesh vest for her performance later in the night, flaunting her toned tum.

Rita Ora and bessie Sam Smith were also out for the festive event.

Reets looked uber cool in a printed yellow tee and monochrome skirt.

The RIP hitmaker debuted a new funky fringe and opted for dramatic make-up with red lippy and electric blue eyeshadow.