Geri Horner celebrates New Year's Eve with a fun throwback to the Spice Girls ...

She is set to kick off a U.K. tour with her band mates in Bournemouth in January.

And Geri Horner, 46, celebrated New Year's Eve by sharing a fun throwback to her Spice Girls heyday, ahead of their reunion in 2019, via Instagram on Monday night.

In the image Ginger Spice was in her iconic Union Jack mini dress, and she posed with her back to the camera, shooting a sultry glance over her shoulder.

Fun: Geri Horner celebrated New Year's Eve with a throwback to the Spice Girls heyday and THAT Union Jack dress... as she looked forward to band's reunion in 2019

Fun: Geri Horner celebrated New Year's Eve with a throwback to the Spice Girls heyday and THAT Union Jack dress... as she looked forward to band's reunion in 2019

Geri's ensemble had a black lace design on the back, and the singer was sure to draw attention to her way with the large white peace sign on the back.

Her signature fiery locks were brushed into a sleek, straight style, while she wore a natural palette of make-up to highlight her pretty features.

Ginger Spice was joined by her fellow bandmates Victoria Beckham, 44, and Mel C, 44, and the mogul looked stunning in a white bikini top and a matching mini skirt and heels.

They're back: Geri is set to kick off a U.K. tour with her band mates Mel B Emma Bunton and Mel C in Bournemouth in January, Victoria Beckham won't be joining in

They're back: Geri is set to kick off a U.K. tour with her band mates Mel B Emma Bunton and Mel C in Bournemouth in January, Victoria Beckham won't be joining in

Classic look: In the image Ginger Spice was in her iconic Union Jack mini dress, while her signature fiery locks were brushed into a sleek, straight style

Classic look: In the image Ginger Spice was in her iconic Union Jack mini dress, while her signature fiery locks were brushed into a sleek, straight style

This comes after the Spice Girls delighted fans as they teased a behind-the-scenes clip from their photoshoot on Twitter on Wednesday.

Geri, Mel B, 43, Emma Bunton, 42, and Mel C larked around in the video, which was filmed ahead of their grand tour announcement.

The band's 1996 hit debut single Wannabe played over the top of the video, with flashbacks featuring the four reveling at being back together again. 

In one look the girls all wore black as they as they joked around on set, while in another Geri donned a dazzling blue sequin fringed mini-dress.

Spice up your life: In December the Spice Girls delighted fans with a behind-the-scenes clip from their photoshoot on Twitter on Wednesday... ahead of their reunion tour next year

Spice up your life: In December the Spice Girls delighted fans with a behind-the-scenes clip from their photoshoot on Twitter on Wednesday... ahead of their reunion tour next year

Emma also appeared in high spirits as she chatted to a make-up artist, while Mel B did her best to entertain the others as she

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