Prince Albert II of Monaco and his wife Princess Charlene hold their twins Prince Jacques (R) and Princess Gabriella (L) as they leave Monaco's Cathedral after their christening ceremony, May 10, 2015. REUTERS/Eric Gaillard TPX IMAGES OF THE DAY

Prince Albert II of Monaco and his wife Princess Charlene hold their twins Prince Jacques and Princess Gabriella while Princess Caroline of Hanover (L) protects Princess Gabriella against the sun as they leave the Monaco cathedral after the Christening ceremony in Monaco May 10, 2015. REUTERS/Eric Gaillard TPX IMAGES OF THE DAY

Prince Albert II of Monaco and his wife Princess Charlene hold their twins Prince Jacques and Princess Gabriella as they leave Monaco's Cathedral after their christening ceremony, May 10, 2015. REUTERS/Eric Gaillard 

Alexandra, Princess Caroline of Hanover's daughter (L), Pauline Ducruet (C) and Camille Gottlieb (R), Princess Stephanie's daughters leave the Monaco cathedral after the christening ceremony in Monaco May 10, 2015. REUTERS/Eric Gaillard

Pierre Casiraghi (top,R), son of Princess Caroline of Hanover, his girlfriend Beatrice Borromeo (top,L) his brother Andrea (R) and Louis Ducruet (L), Princess Stephanie's son leave the Monaco cathedral after the christening ceremony of twins Prince Jacques and Princess Gabriella in Monaco May 10, 2015. REUTERS/Eric Gaillard

Prince Albert II of Monaco and his wife Princess Charlene hold their twins Prince Jacques (R) and Princess Gabriella (L) as they leave Monaco's Cathedral after their christening ceremony, May 10, 2015. REUTERS/Jean-Paul Pelissier TPX IMAGES OF THE DAY

Prince Albert II of Monaco and his wife Princess Charlene leave Monaco's Cathedral after the christening ceremony of their twins, May 10, 2015. REUTERS/Eric Gaillard

Prince Albert II of Monaco and his wife Princess Charlene wave as the leave Monaco's Cathedral after the christening ceremony of their twins, May 10, 2015. REUTERS/Jean-Paul Pelissier 

Prince Albert II of Monaco and his wife Princess Charlene hold their twins Prince Jacques (R) and Princess Gabriella (L) as they pose with godmothers and godfathers while leaving Monaco's Cathedral after their christening ceremony, May 10, 2015. REUTERS/Jean-Paul Pelissier

Prince Albert II of Monaco and his wife Princess Charlene hold their twins Prince Jacques and Princess Gabriella as they pose with family and relatives while leaving Monaco's Cathedral after their christening ceremony, May 10, 2015. REUTERS/Eric Gaillard 

Princess Charlene is cheered by the crowd as she arrives at Monaco's Palace after the Christening ceremony of her twins in Monaco, May 10, 2015. REUTERS/Jean-Paul Pelissier

Prince Albert II of Monaco and his wife Princess Charlene wave as the leave Monaco's Cathedral after the christening ceremony of their twins, May 10, 2015. REUTERS/Jean-Paul Pelissier