There was a party atmosphere at the Vatican on Wednesday (December 17) as hundreds of pilgrims sang Happy Birthday to the pope and thousands danced the tango to mark his 78th birthday.

The pope, who was born in Buenos Aires on Dec. 17, 1936, heard versions of the birthday song in Spanish, Italian and other languages as he was driven through St. Peter's Square to his weekly general audience.

One little boy gave the pope a picture he had drawn with Happy Birthday written on top before being blessed.