Kerry Katona is engaged.The Atomic Kitten singer - who previously married singer/songwriter Brian McFadden in 2002 and taxi driver Mark Croft in 2007 - is set to tie the knot for a third time after her boyfriend George Kay proposed in front of Kerry's four children at the top of Blackpool Tower.Kerry, 32, told the Sunday Mirror: "I'm thrilled but a bit overwhelmed by it all."I was totally in shock about it, Âespecially as I knew nothing, but my girls knew what was going on."There were roses and champagne and George got down on one knee. It was the most romantic thing in the world. I am so happy."George took Kerry and her children Molly, 12 and Lilly-Sue, 10, from her first marriage and Heidi, six, and Max, five, from her second, to Blackpool Tower for what Kerry thought was a family dinner, before he popped the question and Molly presented her mother with a diamond and gold engagement ring. A shocked Kerry added: "I knew something was going on but I had no idea what it was."He got down on one knee and said I was his world and that me and the kids were his family and would I make him the happiest man in the world by Âmarrying him? All the kids were screaming 'say yes Mummy' and they were really Âexcited."The couple have been dating for nine months but George, who was previously, Kerry's bodyguard, had been planning the proposal for two months.He said: "I am absolutely over the moon. I had been ready to explode all day because I was so excited and nervous."I was frightened to death - I am 33 and I have never even thought about getting engaged before. Kerry didn't have a clue what was going on and I got the kids onside, and had to get them to tell lies to their mum about what was Âhappening."