Kerry Katona has slammed reports her marriage is on the rocks.

The Atomic Kitten singer was reported to have cancelled a family holiday to Cape Verde this Christmas because husband George Kay, 34, had been acting ''jealous and clingy'', but she's now spoken out to rubbish the claims.

She wrote on Twitter: ''Every girl dreams of finding her knight in shining armor, but not me...I've already got mine. ;) @mrgsjkay xxxxxxx (sic).''

Former rugby star George was detained under the Mental Health Act earlier this year after suffering a meltdown outside their Oxfordshire home, which he blamed on mixing alcohol, steroids and sleeping pills, and Kerry was reported by a newspaper as questioning their relationship after he walked out on her during a number of arguments.

The publication quoted a source as saying: ''She [Kerry] won't talk about why they row, she just says he's very possessive and insecure.

''She says he's walked out a few times.''

However, 34-year-old Kerry - who was previously married to Westlife singer Bryan McFadden and Mark Croft - has now shot down the idea of a possible split.