The former Atomic Kitten singer is worried she didn’t do more to help her relative Angela – who battled alcoholism before she passed away earlier this month.
She wrote in her column in new! magazine: “My beautiful Auntie Angela sadly passed away and we’re all heartbroken.
“Angela was more like my sister – I’m an only child and I grew up with my Nanny Betty and me and Ang shared a bedroom…
“There’s a sense of guilt where I feel like I could have done more to help her. I think we’re all feeling that as a family.
“She’s left three beautiful, amazing children behind. Alcoholism is a vile disease. Rest in peace Ang, I love you.”
The 40-year-old star remembered her aunt as the “life and soul of the party” who was always on hand to help her organise her home.
Kerry said: “She was the most fun and loving person – she was the life and soul of the party.
“She’d do anything for anybody.
“And she was such a clean freak! When she lived with me she must have reorganised my wardrobe about a million and one times.”
Meanwhile, Kerry – who has daughters Molly, 19, and Lilly-Sue, 18, with Brian McFadden, Heidi, 14, and Max, 12, with Mark Croft, and six-year-old DJ with the late George Kay – admitted her levels of guilt as a parent fluctuate according to how much her brood are annoying her.
She explained: “Emma Bunton says she suffers with working mum guilt and I’ve been feeling that lately because I’ve been away from home so much.
“I’ve been having a massive amount of mum guilt.
“Because I’m the breadwinner of the house, I always go to work because I have to.
“But don’t get me wrong, sometimes I love it.
“It depends on how much the kids are driving me crackers. Sometimes I can’t wait to get out of that bloody door!”