The 29-year-old said she is finding it 'frustrating' that so many lies are written about her fellow Girls Aloud band mate.
Writing in her weekly column for OK magazine, Kimberley said: 'It's kind of weird how people just won't leave Cheryl alone. It's relentless and we're all bored of it.
'It's also really frustrating to hear so many fabrications and complete lies written about her, and especially about her mum Joan too as she is the most harmless person ever and she never interferes in Cheryl's personal or professional life.'
She added: 'Some people form an opinion about things they have no idea about.
'Cheryl has plenty of friends and family around her. She's very happy and I love her lots.'
It has been rumoured that Kimberley and Cheryl, who turns 28 this week, will be reuniting with their Girls Aloud band mates Nicola, Nadine, and Sarah next year for a new album and tour.