Sarah Jessica Parker  and James Wilkie Broderick held hands this morning on their way to school in Manhattan. Both SJP and James kept their heads covered with knit caps, the latest in her long line of fun toppers. She's a longtime fan of milliner Philip Treacy, who recently revealed that he's designing hats to be worn by guests at the royal wedding . The designer wouldn't identify which lucky attendees will wear his pieces to witness Kate Middleton and Prince William walking down the aisle next Friday. SJP and her husband, Matthew, aren't on the exclusive list, but they're plenty busy in the Big Apple. She's been juggling two films, I Don't Know How She Does It and New Year's Eve, as their family of five preps to make the move into their newly purchased $18.9 million home.