An affair between downtown moneyman Christopher O'Neill and his uptown girl -- the gorgeous Princess Madeleine of Sweden -- has become the hottest gossip of Stockholm's long, cold winter.
O'Neill, a 36-year-old millionaire who dispenses financial advice to super-wealthy clients, is "in a love affair" with his 28-year-old Swedish dish, a source close to the couple told The Post.
A Spanish tourist armed with a cellphone took a video of the lovebirds at the Central Park Boathouse that has become an Internet sensation in the Nordic nation. Madeleine, the height of style in a white fur vest, is seen affectionately rubbing O'Neill's arm. 
