Geri Horner felt ''so proud'' when Adele sang the Spice Girls on James Corden's 'Carpool Karaoke' segment.

The 'Hello' hitmaker spoke about her long love of the girl group when she featured on the 'Late, Late Show' earlier this year, and also sang their debut single 'Wannabe', and Geri was overjoyed that the 28-year-old singer ''connected'' with her group over their shared backgrounds.

Geri wrote in an essay for America's Marie Claire magazine: ''I felt so proud watching Adele on James Corden's 'Carpool Karaoke' segment gone viral video saying she loved the Spice Girls.

''She connected with us, she says, because we were just five ordinary girls who 'got out.' 'I didn't know what I wanted to get out of, but I wanted to get out,' she explains. It's something that we - and many other girls, too - felt: We all wanted to get out, stand up and be heard, be counted and have a voice that mattered.

''And there we were in those platform shoes! Our message screamed it for every girl.

''We all felt it, and as sisters all around the world connected through our music and songs, we shared that feeling.

''Suddenly, we weren't alone. Real girl power says you don't have to be perfect, you just have to be united.''

And Geri believes the Spice Girls have always been ''bigger'' than herself and her bandmates, Emma Bunton, Victoria Beckham, Mel B and Mel C.

She added: ''The Spice Girls is bigger than one, two, three, four, or five members. It belongs to us all. ''

During her appearance on 'Carpool Karaoke', Adele told host James she was ''truly heartbroken'' for the first time when Geri quit the Spice Girls in 2003.

The 'Skyfall' singer also discussed how her time as a devotee of the group was a ''really important'' period for her as they were such an inspiration.

She explained: ''It was a huge moment in my life when they came out.

''It was girl power, and it was these five ordinary girls who did so well and got out. I was like, 'I want to get out.' It was a really important period of my life.''