Chelsea Clinton / Marc Mezvinsky

Chelsea Clinton will say "I Do" to her boyfriend of about five years, Marc Mezvinsky on Saturday evening in Rhinebeck, New York. What is said to be the wedding of the year, secrecy and buzz has caused hundreds to crowd into this small village hoping to catch of a glimpse of a former president, a secretary of state or their daughter. The 30-year-old daughter of Bill Clinton and Hillary Rodham Clinton is expected to wed her beau at a ceremony at Astor Courts, the ultra-private Hudson riverfront estate, in front of 400 to 500 guests.