Harry, who will be best man at the royal wedding on 29 April (11), admits he was beginning to think his brother would never propose to Middleton after eight years of courting.
Speaking to reporter Bob Woodruff on U.S. breakfast show Good Morning America on Thursday (31Mar11), Harry said, "We all thought that it was never going to happen for him. But it has happened and everyone is really proud of him."
And Harry is welcoming Middleton into the family with open arms.
He adds, "To have a big sister is very, very nice. She's a fantastic girl. My brother is very lucky. She's very lucky to find my brother. The two of them are a classic match."