Christina Aguilera wears thigh-high leather boots as she performs iconic hit Fighter at Kamala Harris rally in Las Vegas

Christina Aguilera rocked a pair of thigh-high leather boots as she performed Kamala Harris ' presidential rally in Las Vegas on Election Day Eve.

Taking to the stage at the MGM Grand Garden Arena, the singer, 43, sang a powerful rendition of her iconic hit Fighter with election-themed lyrics.

She looked incredible in an edgy ensemble, consisting of a black satin blouse with lace-up hot pants and fishnet stockings.

Before her performance, Christina said: 'Tonight, I'm here in honour of the people who have fought to give us the privilege to be heard.

'Let's raise our voices and vote for freedom!'

She then launched into her song Fighter, singing, 'We won't forget' and 'We'll never look back.'

Christina also performed Beautiful and her Pitbull collab, Feel This Moment.

Regional Mexican band Los Tigres del Norte and EDM duo Sofi Tukker supported her during the show.

The vice president made her second to last stop on the day before Election Day near Pittsburgh, the state's second biggest city and largest city in western Pennsylvania where she asked attendees for their vote.

Harris has been hitting an optimistic note in the final stretch, acknowledging for a second day that she has the momentum.

However, she warned 'the race isn't over, and we must finish strong.'

'Make no mistake, we will win,' Harris declared.

Elsewhere, Christina recently confirmed she will be working with rapper Machine Gun Kelly on a special project celebrating the 25th anniversary of her eponymous debut album.

She has teased an unexpected collaboration with the My Ex's Best Friend hitmaker, 34, by sharing footage of them in the studio together.

In the video, uploaded to her Instagram account, she could be seen filming herself before turning the camera to Machine Gun Kelly, who holds up one of her high heels to his ear as if he was answering a phone.

Fans couldn't contain their enthusiasm as they flocked to the comment section to share their excited reactions to the musicians teaming up together.

Christina confirmed she would be releasing live studio re-imaginings of her debut album for an episode of Spotify Anniversaries, which will be released on September 23.