The couple has become the centre attraction for the world media after their announcement of wedding plan.
During a press conference in London, Middleton on Nov 16 informed that William had popped the question during a holiday in Kenya three weeks ago.
"It's quite a daunting prospect but hopefully I'll take it in my stride. But William's a great teacher so hopefully he'll be able to help me along the way," added Middleton.
Middleton and William met in 2001 at St Andrews University in Scotland where they were both studying art history. They broke up briefly in 2007 but soon got back together.
Cracking a joke that "They have been practicing long enough," the father of the groom Prince Charles stated that he was "thrilled" at the engagement.