Details: William, Kate plan royal wedding

"We're massively excited," William said in a televised interview that marked the first time the couple has spoken publicly about their love affair, which dates eight years back to their days as university students. "We're looking forward to spending the rest of our lives together."

William said he had given Kate his mother's sapphire and diamond engagement ring as a way of making Diana part of his special day.

"I thought it was quite nice, because obviously she's not going to be around to share any of the fun and excitement of it all. This was my way of keeping her close," William said.

William, wary of a media he holds partly responsible for his mother's death in a Paris car crash in 1997, said he had taken his time in proposing to give Kate a sense of what life in the royal family was like.

"I wanted to give her a chance to see in and to back out if she needed to before it all got too much," William said.

Middleton acknowledged that being in the royal family was "a daunting prospect."

The interview reminded many of a similar TV appearance by Charles and Diana shortly after they became engaged. Diana seemed frightened of the limelight and withdrawn; by contrast, Middleton seemed at ease in front of the cameras. She said she wished she had met Diana.

"I would love to have met her. She's an inspirational woman," Middleton said as William looked on.

The future of the royal family depends to no small degree on the success of their union.

Middleton brings youth and glamour to a monarchy tarnished by divorce and scandal. The marriage will link Middleton — a wealthy commoner whose parents, self-made millionaires, founded a successful mail-order party supply business after working in the airline industry — with William, scion of one of the richest families in the world.

A strong, stable marriage — one that lasts decades and produces heirs — could go a long way toward undoing the damage from Charles' and Diana's ugly squabbling and televised confessions of adultery.

"This is their chance to rejuvenate the dynasty," said Patrick Jephson, former private secretary to Diana. "This is an opportunity for a welcome national celebration."