MUNICH — Bridie O'Halloran drank the first beer of her life at Oktoberfest.

Oktoberfest has opened in Munich after the ceremonial beer keg-tapping. Mayor Dieter Reiter officially started the 189th Oktoberfest at noon when he inserted the tap into the first keg.

A parade of thousands in traditional southern German costume paraded through Munich on Sunday morning to mark the second day of Oktoberfest, as many lined the streets to take in the sight. The parade included groups of traditional dancers as well as brewery carriages,

The Oktoberfest hosts arrive Saturday for the start of the 189th beer festival in Munich, Germany. People cheer with mugs in the Hofbraeuhaus beer tent Saturday, the first day of the 189th Oktoberfest beer festival,

Thousands of beer lovers descended on the German city of Munich on Saturday for the opening of Oktoberfest. Munich Mayor Dieter Reiter officially started the event at noon when he inserted the tap into the first keg,

Thousands of beer lovers celebrated in the Munich, Germany, fairground as the first to clink their mugs during Oktoberfest, the world’s largest folk festival.

Go to any Oktoberfest celebration today, and you'll likely hear strains of "Ein Prosit" everywhere. Here's the history behind this popular beer drinking song.