Cheryl appeared on the BBC One programme to discuss her latest work with Childline and acted extremely coy while being questioned.
One Show host Matt Baker had a glint in his eye as he introduced the star to the audience at home, while explaining that she is now known as "just Cheryl".
Cheryl, who was wearing a black jumpsuit, replied: "Yes, just Cheryl." Matt then asked: "It feels like a fresh start, are you enjoying life at the moment? How are you? You good?"
Smiling, with her hands in her lap and covering her tummy, she simply replied: "I'm great, really well." Quickly batting the question back, she asked: "Yourself?"
Cheryl has neither confirmed or denied whether she is expecting.
Geordie lass Cheryl has teamed up with Childline and sat on The One Show alongside Esther Rantzen to raise awareness of the service, which helps children and young adults.
The former Girls Aloud star, who is rumoured to be expecting her first child with boyfriend Liam Payne, said: "Kids don't have the courage to talk to someone, that's why Childline is amazing. It's completely confidential. You can just go online and have a chat, like texting a friend."
Reflecting on her own teenage years, she added: "Your hormones play a huge part in your teenage years. I would not go back to my teenage years for love nor money.
"I just want to help young people - the next generation, to have hope and opportunity.
"Life is not perfect, it's not the Instagram pictures. You are going to have hardship and hard times."
When asked what she would tell her teenage self, Cheryl replied: "Not to worry so much, to try and relax and talk more about how I was feeling. Whatever you're going through, you come through it."
During her appearance, Matt pointed to the waiting photographers outside and asked Esther to stand in front of the window so they couldn't get a picture of Cheryl as she left the studio. Esther, meanwhile, did not leave and continued with the show alongside fellow guest, Olympic cyclist Chris Hoy.
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