British royal Prince Charles' wife CAMILLA, DUCHESS OF CORNWALL is glowing with excitement after learning she is to be a grandparent. Camilla's son, TOM PARKER-BOWLES yesterday (17MAR07) announced that his fashion journalist wife SARA BUYS is three-months pregnant. Tom, who is said to be quite close to his stepfather - the PRINCE OF WALES, shocked his mother with the news last week (ends16MAR07). He says, "We have told our friends and family and they are all delighted. "Mummy is absolutely over the moon at the prospect of becoming a grandmother. "Sara is going for another scan next week and we're hoping everything will be find. "I'm very excited and honestly don't mind if it's a boy or a girl, as long as the baby is healthy."