is planning a secret Elvis-themed wedding.
The TV presenter, the daughter of rock legend Ozzy Osbourne, reportedly wants to wed model Luke Worrell in Las Vegas next spring after accepting his marriage proposal two months ago.
A friend of Kelly said: "They want their wedding to be fun rather than a big, solemn occasion, which is why they are thinking something Vegas-style would work best. They are even toying with the idea of an Elvis-themed ceremony.
"They share the same sense of humour and unconventional streak, so they wanted to celebrate their love for each other with something different and memorable."
The couple - who divide their time between London and Los Angeles - are set to spend their honeymoon on the idyllic Caribbean island of St. Lucia. They will enjoy a few days at a luxury private resort together, before being joined by their closest friends and family for a week of celebrations.
Luke, 19, is believed to have asked 24-year-old Kelly to marry him while they were at New York Fashion
Week in September.
The source added to Britain's Star magazine: "Kelly was over the moon. And although he bought her a ring, they both agreed they would keep things hush-hush for a while.
"She wore it a couple of times back in September but it was getting a lot of scrutiny and she didn't want the pressure."
Kelly reportedly told her mother Sharon about the engagement straight away, but Ozzy didn't find out for several weeks.