London, Nov 23 Pakistani heart surgeon, whom Princess Diana dubbed her "Mr Wonderful", is all set to tie the knot with a medical colleague 21 years his junior.

Hasnat Khan, 51, has secretly become engaged to Alexandra Panagoulas, 30 and the pair are now living together in London.

Friends have said that Panagoulas, originally from Athens, has made him "happier than he's been in ages".

"It is very happy news. Hasnat is in love with her and he is a good man, a man of quality. I like him very much," the Daily Express quoted Panagoulas's mother, Agallia, as saying.

After Diana's death, Khan, a mild and discreet figure, has been unlucky in love-he had an arranged marriage in 2006 in Pakistan ended after 18 months.

However, in Panagoulas, who moved to Britain from Athens at the age of 18, he is said to have found his "perfect match".

Diana and Khan enjoyed a two-year relationship that only ended a few months before she died in 1997.

At Princess Diana's inquest last year, one of her closest friends told how she was "very much in love with him... and wanted to marry him".

While Khan did not give evidence directly, his witness statement to police in the wake of her death was read out.

"Diana and I had a very good relationship. The only problem we did have was with the media and the only place we could have any real privacy was at Kensington Palace as they could not get to us there.

"We had a normal sexual relationship and I've no reason to think Diana was ever unfaithful to me," he said. (ANI)