The Girls Aloud star is believed to have gained half a stone in the past two months – taking her to a size eight - and is said to be keen to make sure that her weight gain doesn’t spiral out of control.
A source told Now magazine, “Cheryl likes her new shape and feels healthier than ever, but any weight gain on her petite 5ft 3in frame really shows.
“It's something she worries about because she's constantly being papped. She definitely doesn't want to be drawn into the usual 10lb Christmas weight gain that the rest of us experience.”
A spokesman for Cheryl was unavailable for comment.