A journalist catches up on some sleep amoungst media stepladders outside the Lindo Wing of Saint Mary's Hospital in London, on July 16, 2013, where Prince William and his wife Catherine's baby will be born. (Photo JUSTIN TALLIS/AFP/Getty Images)
Royal Baby
Clocks featuring today's new twitter hashtag "#thebigkatewait" are pictured outside the Lindo Wing of St Mary's Hospital in London, on July 17, 2013, where Prince William and his wife Catherine's baby is expected to be born. Britain's Prince Charles joked Monday that his son Prince William's baby was "hopefully" on the way, but wife Camilla went further, saying it could arrive "by the end of the week". (Photo credit LEON NEAL/AFP/Getty Images)
Royal Baby
A board showing bookmakers odds on the name and birth date of the Royal baby is displayed outside the Lindo Wing of Saint Mary's Hospital in London, on July 17, 2013, where Prince William and his wife Catherine's baby will be born. Queen Elizabeth II, it seems, is just as impatient as her subjects for the royal baby to arrive this week -- because she is going on holiday. (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
Royal Baby
A man holds a placard as he waits outside the Lindo Wing of St Mary's Hospital in London, on July 18, 2013, where Prince William and his wife Catherine's baby is expected to be born. The long wait for the birth of Britain's royal baby is record business for bookmakers, as punters worldwide bet on a girl called Alexandra to be born any day now. (Photo credit should read BEN STANSALL/AFP/Getty Images)
Royal Baby
Royal supporter Terry Hutt poses for pictures outside the Lindo Wing of St Mary's Hospital in London, on July 19, 2013, where Prince William and his wife Catherine's baby is expected to be born. The long wait for the birth of Britain's royal baby is record business for bookmakers, as punters worldwide bet on a girl called Alexandra to be born any day now. (Photo credit should read BEN STANSALL/AFP/Getty Images)
Royal Baby
A photographer takes a picture of a toy car delivered as a gift outside the Lindo Wing of St Mary's Hospital in London, on July 19, 2013, where Prince William and his wife Catherine's baby is expected to be born. The long wait for the birth of Britain's royal baby is record business for bookmakers, as punters worldwide bet on a girl called Alexandra to be born any day now. (Photo credit should read BEN STANSALL/AFP/Getty Images)
Royal Baby
Look-alikes of Catherine, Duchess of Cambridge and William, Duke of Cambridge pose for photographers outside the Lindo Wing of St Mary's Hospital in London, on July 19, 2013, where Prince William and his wife Catherine's baby is expected to be born. The long wait for the birth of Britain's royal baby is record business for bookmakers, as punters worldwide bet on a girl called Alexandra to be born any day now. (Photo LEON NEAL/AFP/Getty Images)
Royal Baby
Royal supporter Terry Hutt (L) is pictured on a bench where he has been camped out for 9 days outside the Lindo Wing of St Mary's Hospital in London, on July 19, 2013, where Prince William and his wife Catherine's baby is expected to be born. The long wait for the birth of Britain's royal baby is record business for bookmakers, as punters worldwide bet on a girl called Alexandra to be born any day now. (Photo credit should read BEN STANSALL/AFP/Getty Images)
Royal Baby
A royal fan holding little prince and little princess balloons stands outside the Lindo Wing of St Mary's Hospital in London, on July 20, 2013, where Prince William and his wife Catherine's baby is expected to be born. The long wait for the birth of Britain's royal baby is record business for bookmakers, as punters worldwide bet on a girl called Alexandra to be born any day now. (Photo credit JUSTIN TALLIS/AFP/Getty Images)