The Voice UK: Leigh-Anne Pinnock and Mel C lead the star-studded mentors

The first round of the semi-finals of The Voice UK will begin on Saturday night with a star-studded line-up of celebrity mentors. 

Leigh-Anne Pinnock and Mel C will join coaches Anne-Marie and Sir Tom Jones and their respective team singers ahead of the show.

The Little Mix singer, 29, and the Spice Girl legend, 47, posed for a series of smouldering promo shots ahead of the episode, which will air on ITV on Saturday.

Girl power: Leigh-Anne Pinnock, 29, will join coach Anne-Marie in a star-studded line-up of celebrity mentors for the first round of the semi-finals of The Voice UK on Saturday night

Leigh-Anne cut a typically stylish figure as she posed with Anne-Marie, 29, in a quirky white jacket dress, which featured a hood and ruched detailing at the front of the garment.

The Little Mix star teamed the edgy look with a pair of black thigh-high boots and accessorised with a pair of gold hoop earrings. 

Elsewhere in the snap, Anne-Marie crossed her arms wearing a printed short-sleeved blouse with a knitted vest and a pair of leather trousers.

The Birthday singer wore her cropped pink locks in a sleek style and wore soft touches of make-up. 

Icons: Spice Girl legend Mel C, 47, cut a striking figure next to Sir Tom Jones as she posed for a promo shot ahead of the episode, which will air on ITV on Saturday

Icons: Spice Girl legend Mel C, 47, cut a striking figure next to Sir Tom Jones as she posed for a promo shot ahead of the episode, which will air on ITV on Saturday

Celebrity guests: This weekend's semi-finals will also see The Script's Danny O’Donoghue, 40, joining coach Will.I.Am as a guest mentors to his team

Celebrity guests: This weekend’s semi-finals will also see The Script’s Danny O’Donoghue, 40, joining coach Will.I.Am as a guest mentors to his team 

Melanie Chisholm – aka Mel C – cut a striking figure next to Sir Tom Jones as she posed with one hand on her hip wearing an all-black power suit with silver detail on the sleeves.

While the Welsh singer, 80, wore a maroon shirt and kept his arms crossed as he prepared to guide his contestants through the next round of the singing competition.

This weekend’s semi-finals will also see The Script’s Danny O’Donoghue, 40, and singer-songwriter James Bay, 30, joining coaches Will.I.Am and Olly Murs as guest mentors.

Team Olly: Singer-songwriter James Bay, 30, will join The Voice coach Olly Murs as he mentors his contestants through the first semi-finals

Team Olly: Singer-songwriter James Bay, 30, will join The Voice coach Olly Murs as he mentors his contestants through the first semi-finals

Tense: Saturday night's show sees the first of two semi-finals as acts sing for a place in the live final in front of the four coaches as well as a virtual studio audience

Tense: Saturday night’s show sees the first of two semi-finals as acts sing for a place in the live final in front of the four coaches as well as a virtual studio audience

Saturday night’s show sees the first of two semi-finals as acts sing for a place in the live final. 

Each coach will mentor six contestants, who they chose from The Battle rounds, five from their original line-up and one who they managed to steal from one of the other coaches.

The Voice contestants will perform in front of the four coaches as well as a virtual studio audience and photos released ahead of Saturday night’s show gave a sneak preview of their performances. 

Performance: Anne-Marie's team for the first round of the semi-final is made up of three contestants with Sweeney, 30, from London, taking to the stage

Performance: Anne-Marie’s team for the first round of the semi-final is made up of three contestants with Sweeney, 30, from London, taking to the stage

Team Anne: He will be joined by Stephanee Leal, 25, who now lives in Southampton

Big stage: Leona Jorgensen, 26, from Sheffield sings on the semi-final of The Voice UK

Team Anne: He will be joined by Stephanee Leal, 25, (left) who now lives in Southampton and  Leona Jorgensen, 26, from Sheffield

Battle: Mariam Davina, 18, from London, will perform for Sir Tom Jones' team in the first of The Voice semi-finals

Battle: Mariam Davina, 18, from London, will perform for Sir Tom Jones’ team in the first of The Voice semi-finals

Semi-final: Other contestants from Team Tom will include Midé, 33, from London

Singer: Benjamin Warner, 23, from Manchester performs in The Voice semi-final

Semi-final: Other contestants from Team Tom will include Midé, 33, (left) from London, and 23-year-old Benjamin Warner from Manchester

Anne-Marie’s team for the first round of the semi-final is made up of Leona Jorgensen, 26, from Sheffield, as well as Sweeney, 30, from London, and Stephanee Leal, 25, who lives in Southampton.

Contestants from Team Tom will include Mariam Davina, 18, from London, Midé, 33, from London, and 23-year-old Benjamin Warner from Manchester.

Team Will.I.Am will see contestant Adeniké, 28, from South London, perform along with Nadia Eide, 32, from Oxford, and Lauren Drew, 27, from Wales.

Team Will.I.Am: The Voice contestant Adeniké, 28, from South London, will sing her heart out on Saturday night

Team Will.I.Am: The Voice contestant Adeniké, 28, from South London, will sing her heart out on Saturday night 

Stars: She will be joined on Team Will.I.Am along with Nadia Eide, 32, from Oxford

Contestant: Lauren Drew, 27, from Wales performs on The Voice UK

Stars: She will be joined on Team Will.I.Am along with Nadia Eide, 32, from Oxford, (left) and Lauren Drew, 27, from Wales

Coached: Team Olly will be made up of Joe Topping, 42, from The Wirral

Stage: 34-year-old Jason Hayles sings on The Voice

Coached: Team Olly will be made up of Joe Topping, 42, (left) from The Wirral, 34-year-old Jason Hayles (right)

Brothers: Singing duo Jordan and Wesley, 27 and 30, from Coventry, will make up the rest of Team Olly for the first semi-final

Brothers: Singing duo Jordan and Wesley, 27 and 30, from Coventry, will make up the rest of Team Olly for the first semi-final

And Team Olly will be made up of Joe Topping, 42, from The Wirral, 34-year-old Jason Hayles and brothers Jordan and Wesley, 27 and 30, from Coventry.

Emma Willis will be back on screens on Saturday night to host the first of The Voice UK’s semi-finals.

The TV presenter, 44, looked stunning in shots ahead of the show, as she wore a full-length black dress with feathered detail at the sleeves.

The Voice UK’s first semi-final airs on Saturday at 8.30pm on ITV, with the second airing on March 13.  

Glamour: The Voice UK host Emma Willis, 44, looked stunning in shots ahead of Saturday night's show, as she wore a full-length black dress with feathered detail at the sleeves

Glamour: The Voice UK host Emma Willis, 44, looked stunning in shots ahead of Saturday night’s show, as she wore a full-length black dress with feathered detail at the sleeves