Prince William: I fell for Kate Middleton's really naughty sense of humour
The couple, who became engaged in Kenya three weeks ago, share a sense of fun.
'We met at St Andrews and were friends for over a year first and it blossomed from then on,' Will explained in an ITV interview last night.
'We shared the same interests and she's got a really naughty sense of humour.'
Kate admitted she 'went bright red and scuttled off' when she first met the Prince, but they gradually got to know each other and became close friends.
Wills and Kate, both 28, moved in together at university - sharing with other flatmates - and their romance took off after that.
William proposed with his mother's sapphire and diamond engagement ring.