The star posted the pic on her Instagram page, alongside the caption: "Train selfie! HeeHee x."
In the photo, Claire can be seen wearing pink headphones and minimal make-up.
Her face is slightly turned to the camera and in the background, the train carriage can be seen.
Claire has previously battled with confidence issues connected to her weight, and admitted to suffering from an eating disroder when she was in Steps in the 90s.
Thankfully, she's feeling more confident than ever now after dramatically losing weight.
Earlier this month, Claire showed off her new svelte figure and admitted that she was "bored" of yo-yo dieting.
Former Celebrity Big Brother star Claire has since revealed that she lost the weight as she wants another baby.
Watch Claire in Steps' Chain Reaction below: