Just married: Will and Kate celebrate

>>> a long way from where we are right now, a very different story about families coming together today. prince william and kate middleton entered into marriage with an estimated 2 billion people watching , a royal wedding truly for the digital age. kate snow is outside buckingham palace for us. good evening.

>> reporter: it was a moment of history. they are officially now the duke and duchess of cambridge, but tonight, they're just william and kate having a late-night party right here at buckingham palace with all of their closest family and friends . it was majesty on a human scale . the embodiment of national pride and centuries of tradition. an estimated 1 million spectators in london alone. perhaps 2 billion more watching around the world. the day began at historic westminster abbey decked out like an anglish garden with nearly 2,000 guests. the prime minister, elton john , the beckhams. their closest friends and family, royal and otherwise. but this was william and kate 's day. he arrived with best man prince harry . moments later, right on time, kate took center stage . a first glimpse of the dress by british designer sarah burton for alexander mcqueen . she wore a halo of diamonds, a tiara borrowed from queen elizabeth herself. you look beautiful, the groom told his nervous bride as together they became husband and wife.

>> i william author philip louis take thee katherine elizabeth.

>> i take william william arthur philip louis to be my husband.

>> i pronounce that they be man and wife together in the name of the father and the son and the holy ghost .

>> and with that, the future king and queen of england began their life together. for the ride to buckingham palace , an open carriage. there was no rain to mar this parade, and the british showed once again, they know how to do pomp and pageantry. as william and kate reached the palace, thousands crowded the procession route. this was the moment they were waiting for. a moment with echoes of history and family ties . the kiss was expected. but then, with the crowd calling for more --

>> kiss! kiss!

>> reporter: -- another. the couple's public day was over. but wait, william and kate had one more surprise. and a break with tradition that delighted the crowd. a drive from the palace with the prince behind the wheel of a purple aston martin convertible on loan from his father. we saw centuries of tradition today, but with the hope of a new beginning. take a look at these newest pictures we have gotten in. brian, it shows the couple all decked out, ready to celebrate the night away. so many people i talked with today said they feel like today they witnessed a new chapter beginning in the monarchy. brian. hit