TRAVELPhoto tour: Ship christenings with Queen Elizabeth IIBritain's Queen Elizabeth officially names P&O Cruises new flagship, the 143,000-ton Britannia at a ceremony in Southampton, England on March 10, 2015.Steve Dunlop PhotographyQueen Elizabeth II has a word with her husband, Prince Philip, while on stage at the christening of P&O Cruises' Britannia.Steve Dunlop PhotographyBritain's Princess Elizabeth (the future Queen Elizabeth II) christens Cunard's Caronia in Clydebank, Scotland on Oct. 30, 1947. The ship sailed for the line until 1967.Courtesy Cunard LineSince becoming Britain's monarch in 1952, Queen Elizabeth II has gone on to christen three more Cunard ships. Here, she presides over the naming of the 1,777-passenger Queen Elizabeth 2 on Sept. 20, 1967.Courtesy Cunard LineBritain's Queen Elizabeth II made a final visit to the Queen Elizabeth 2 on June 2, 2008 -- more than 40 years after christening the vessel. The Queen Elizabeth 2 retired from the Cunard fleet shortly thereafter.Arthur Edwards, AP Pool PhotoQueen Elizabeth II also christened Cunard's current flagship, the 2,620-passenger Queen Mary 2, in Southampton, England on Jan. 8, 2004.Courtesy Cunard LineCunard's Queen Mary 2 was given a fireworks salute as it set sail for the first time after being christened by Queen Elizabeth II. At 148,528 tons, it is the largest passenger ship ever named by a monarch.Courtesy Cunard LineSeventy-two years after her mother christened Cunard's original Queen Elizabeth, Britain's Queen Elizabeth II presses a button to release a bottle against the bow of the latest ship to carry the name. The ceremony took place on Oct. 11, 2010 in Southampton, England.Courtesy Cunard LineQueen Elizabeth II receives applause at the naming ceremony for Cunard's Queen Elizabeth on Oct. 11, 2010.Courtesy Cunard LineQueen Elizabeth II is joined on stage by Carnival Corp. Chairman and CEO Micky Arison (left) during the naming ceremony for Cunard's Queen Elizabeth on Oct. 11, 2010. Miami-based Carnival Corp. acquired Cunard since 1998.Courtesy Cunard LineThe crew of the Queen Elizabeth welcomes Queen Elizabeth II aboard the vessel before the ship's naming on Oct. 11, 2010.Courtesy Cunard LineQueen Elizabeth and Prince Philip arrive for the christening of P&O Cruises' Britannia on March 10, 2015.P&O CruisesBritannia captain Paul Brown sits next to Queen Elizabeth II at the christening of the ship on March 10, 2015.Steve Dunlop Photography, Steve DunlopQueen Elizabeth II with Britannia captain Paul Brown during the christening ceremony for the ship in Southampton, England on March 10, 2015.James MorganQueen Elizabeth smiles at the crowd during the christening of P&O Cruises' Britannia on March 10, 2015.P&O CruisesRed, white and blue confetti rains down on attendees moments after the christening of P&O Cruises' Britannia on March 10, 2015.Steve Dunlop PhotographyThe remnants of a bottle of British-made sparkling wine that smashed against the hull of P&O Cruises' Britannia during the ship's christening ceremony on March 10, 2015.Steve Dunlop PhotographyPaul Brown, left, captain of the new cruise ship Britannia, shows off the ship to Queen Elizabeth II on March 10 at Ocean Cruise Terminal in Southampton, England.Pool Photo By Richard PohlChristened by Queen Elizabeth II on March 10, 2015, P&O Cruises' Britannia is the largest cruise ship ever built for the British market.P&O CruisesQueen Elizabeth II and Prince Philip meet with P&O Cruises staff during the christening of the line's new Britannia.James MorganQueen Elizabeth II tours the bridge of P&O Cruises' Britannia after christening the vessel on March 10, 2015.James MorganQueen Elizabeth II meets with officers of P&O Cruises' Britannia.James MorganQueen Elizabeth II with British celebrity chef Marco Pierre White at the christening celebration for P&O Cruises' Britannia. White has created menus for the ship.James MorganQueen Elizabeth II looks at desserts while touring P&O Cruises' Britannia during its christening celebration.James MorganQueen Elizabeth II and Prince Philip with officers of P&O Cruises' Britannia.James MorganThe Regimental Band of the Irish Guards performs at the christening of P&O Cruises' Britannia. The Irish Guards are part of the Household Division, tasked with protecting the life of Queen Elizabeth II and the royal household.Steve Dunlop PhotographyDancers from popular British television show 'Strictly Come Dancing' perform at the christening of P&O Cruises' Britannia on March 10, 2015.Steve Dunlop PhotographyA contemporary bagpipe band called the Red Hot Chilli Pipers performs at the christening of P&O Cruises' Britannia on March 10, 2015.Steve Dunlop PhotographyQueen Elizabeth and Prince Philip on stage with Carnival Corp. chairman Micky Arison and other dignitaries at the christening of P&O Cruises' Britannia on March 10, 2015.Steve Dunlop PhotographyQueen Elizabeth, Prince Philip and other dignitaries look on as the Royal Marines band performs during the christening ceremony for P&O Cruises' Britannia.P&O CruisesP&O Cruises' Britannia arrives in Southampton, England in advance of its March 10, 2015 naming by Britain's Queen Elizabeth.James MorganQueen Elizabeth on stage just moments before christening P&O Cruises' Britannia.P&O Cruises