A Noughties popstar looked worlds away from her heyday as she appeared on The One Show this week.

She left fans gobsmacked as she graced TV screens with a striking new, dramatic look.

Viewers couldn’t believe how much the songstress has changed, with some penning on X they still thought she was ’25 years old’. 

The Scottish star debuted an undercut hairdo and wore a swipe of pink lipstick to match her jumper and nails. 

The hitmaker is renowned for her hit song Suddenly I See and 2004 album Eye to the Telescope.

Can you guess who it is?

A Noughties popstar looked worlds away from her heyday as she appeared on The One Show this week

The hitmaker is renowned for her hit song Suddenly I See and 2004 album Eye to the Telescope… Can you guess who it is?

It’s… KT Tunstall!

The singer, 49, shocked fans with her completely unrecognisable look as she spoke to host Alex Jones.

Some fans wrote on Instagram: ‘What? Thought she was still like 25′, That whole album was amazing and she’s looking very cool’.

KT appeared on the show to celebrate her single Suddenly I See turning 20 years old. 

Speaking of the single, she said: ‘I have people coming up to me going ‘I’ve listened to you my whole life. 

‘I’m like “what?” It was amazing because the song ended up much better known than me.  I remember going to a party and someone went “oh, what do you do?”

‘I said it was the song at the beginning of Devil Wears Prada and she went “oh my God, you’re on the party playlist”. I was so lucky to have a song that connected with people like that.’

In January, KT revealed she is considering adoption having been adopted as a baby herself.

It’s… KT Tunstall! The singer, 49, shocked fans with her completely unrecognisable look as she spoke to host Alex Jones

Viewers couldn’t believe how much the songstress has changed, with some penning on X they still thought she was ’25 years old’

She said the thought of taking on parental responsibility for a child ‘does cross my mind’.

KT, who does not have any children, was put up for adoption when she was just days-old newborn and then taken in by Scottish couple David and Rosemarie Tunstall.

The Suddenly I See singer said as she approaches her 50th birthday she is contemplating adopting a child. She lives with partner Chris Light in the USA.

Speaking to Saga magazine, she said: ‘I was adopted along with my older brother, but my mum and dad did have a son after being told they couldn’t have children.

‘Mum always joked, “Everyone else got what they got, but you got chosen”, though the truth is you’re always going to have a bit of an abandonment issue.

‘It didn’t hit me until late in life. I found my biological mother at the age of 23 and it was really enriching to my life – but tough.

‘I had never been able to find my biological father so I went on ITV show Long Lost Family and they did, but he’d pᴀssed away.

‘When the programme got in touch with my two sisters, they had no idea they had a sibling, so they broke it to them gently, saying, ‘We think you’ve got a sister you didn’t know you had – and she’s famous’.

KT pictured on stage with her BRIT Award in 2006

Read More KT Tunstall reveals she is thinking of adopting a child as 50th birthday looms – after being adopted herself

‘And the younger one said, ‘It’s KT Tunstall!’ She got my album, which they had in the house, and held it up against the picture of our dad and just went, ‘They look exactly the same’.’

The Black Horse and the Cherry Tree hit-maker continued: ‘Adoption does cross my mind.

‘It’s an amazing thing to do if you are a secure enough adult to provide an amazing life for a kid.

‘I’m turning 50 soon. Ask me then.’

Tunstall was born to biological parents Carol Orr and John Corrigan but was placed for adoption at 18 days old.