The former Pussycat Dolls singer joined the ITV competition series, replacing Kelly Rowland, in 2012, mentoring acts alongside the former Take That star.
Showing support for the 51-year-old, the Don’t Cha singer hung out backstage at his solo show, A Different, which charts Gary’s life, including his rivalry with Robbie Williams.
The pair beamed from ear to ear as they posed for pictures at The Duke of York’s Theatre and warmly embraced one another.
Gary opted for a casual look, wearing a breton T-shirt and grey jeans, while Nicole looked summery in a crop top and a flowing lacey jacket.
Sharing three snaps on Instagram, Nicole captioned the post: ‘Was so awesome to see my dear friend @officialgarybarlow on “A Different Stage” with his revolutionary own show! You had me laughing, crying and singing my heart out! ???????? you Gaza!’
Fans flocked to fawn over the reunion, with one writing: ‘Friends are like Diamonds their are so valuable.’
Another penned: ‘This last pic is so cute ????.’
A commenter added: ‘We need a duet from you and @officialgarybarlow on your next project that would be Epic and so beautiful and amazing.’
While The X Factor UK is no more, the show’s team has recently revealed unseen footage of one of their most famous contestants, One Direction.
The exact origins of the chart-topping band had always been shrouded in mystery, with several making claims they were behind it – like Liam Payne saying the group was built around his, er, face.
However, the footage shows that Nicole and a very strong influence in shaping the line-up, instantly recognising Harry Styles’ charisma.
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