Let the festivities begin.

Buckingham Palace has planned a myriad of events to mark the monumental occasion.

The countdown is officially on.

Queen Elizabeth smiling

On Wednesday, June 1, Buckingham Palace released Queen Elizabeth’s official portrait, perToday.

The queen was a picture of pure elegance as she posed in her powder blue wool coat and pearls.

While the queen leads the event from Windsor Castle, Prince William will follow at Buckingham Palace.

Queen Elizabeth and Prince William

Town & Countryreports that a 68-foot tree was built outside of Buckingham Palace for this very moment.