The brunette actress has been embroiled in a war of words with Katie after the former glamour model branded Kelly a ''heffer''.
Despite Katie's cruel jibe, the 'Piranha 3D' star insists she is comfortable with her weight and refuses to take the ''hilarious'' comment to heart.
Kelly told Easy Living magazine: ''To be called a heffer is the funniest thing I've ever heard. I mean - it's ridiculous. Do I look like a heffer to you? Even if it was true, it would be hilarious. She's delusional. The amount of women tweeting me saying lovely things and sticking up for me after that - it was overwhelming.
''Because I was a dancer for years - I did 10 years of ballet every single day - I'm quite strong and toned underneath, so even if I do put a bit of weight on, it doesn't take long to get it back. All that muscle memory and posture goes a long way.''
Kelly - who is currently dating her former flame Danny Cipriani after reuniting with him earlier this year following their initial break-up in 2010 - also revealed she enjoys living in her own ''bubble'', but always turns to her mother Sandra for advice on ''serious'' matters.
She explained: ''When it's a serious thing, it will always be my mum. No matter how similar we are, and how much we bicker and fight, when it comes down to it, my mum is always next to me.
''But my problems are not real-life problems. I live in a bit of a bubble. It's not like I'd call up my cousin and say, 'Oh God, today they only had blueberries on set... ''
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