Kate and Wills celebrate fourth Anniversary as the world awaits Royal baby’s birth

She might be heavily pregnant, but Kate Middleton is still mum to an energetic toddler. And yesterday the Duchess of Cambridge drove Prince George to his weekly swimming lesson at Buckingham Palace, delighting the crowds of well wishers camped at the gates of by driving through the excited throng. The Duke and Duchess delighted royal watchers yesterday by delivering coffee and pastries to fans gathered outside the Lindo Wing of St. Mary's Hospital. In what could be a clue as to the sex of the impending arrival, the gesture, delivered by Kensington Palace aids, was wrapped in pink ribbon. The couple will mark their fourth wedding anniversary today, with punters hoping it will be a double celebration. Kate, who is thought to be four days overdue, is a regular visitor to the Queen's swimming pool, where 21-month-old George is learning to swim. Accompanied by five bodyguards and Prince George's nanny Maria Borrallo, she drove her black Range Rover onto the palace forecourt and spent almost two hours there before driving herself home again.