Kate Middleton's weight in spotlight ahead of royal wedding

LONDON - How thin is too thin? Not even Kate Middleton has escaped the thorny debate.

The willowy princess-to-be's appearance and reported comments during a visit to Northern Ireland sparked some concerns Wednesday about whether she's losing too much weight ahead of the April 29 royal wedding. The subject even became a topic on Twitter.

In front-page newspaper photographs, Middleton appears to be in good health if slightly slimmer than usual, but reporters heard many in the Belfast crowd of well-wishers on Tuesday making comments that she looked a bit gaunt.

One woman, Heather Lindsay, told Middleton "not to lose any more weight," and said Middleton remarked that it was all part of the wedding plan.

Palace officials Wednesday refused to say whether Prince William's fiancee is trying to lose a few pounds before the big day. They also declined to specify her height, weight or to comment on her words in Northern Ireland.

"It was an off-the-cuff comment," said a press aide to Prince Charles who asked not to be identified because of palace protocol. "It's a hugely private matter."

Prince Charles' press aides have been protective of Middleton's privacy since the engagement was announced in November. Middleton was active in many sports during her university days and her weight hasn't seemed to have fluctuated much since then.