"Mr. Wu" is no longer a cub.
Xiao Liwu, the San Diego Zoo's youngest giant panda, celebrated his second birthday Tuesday.
When he entered the exhibit just before 9 a.m., Mr. Wu (as he's called by zoo staff) found a custom cake of apples, carrots, sweet potatoes and honey.
He also posed for lots of pictures taken by his adoring fans who visited the San Diego Zoo's panda exhibit.
The day marked a special milestone for the cub whose name means "Little Gift."
Senior Mammal Keeper Jennifer Becerra said the newest member of the panda family is now considered an adult.
Historically, cubs born in San Diego are also transferred back to China after they reach the age of two.
Images: San Diego Zoo's Panda Cub Xiao Liwu
Xiao Liwu was born on July 29, 2012, to Bai Yun and Gao Gao.
The zoo touts the largest number of cubs born in the United States. Bai Yun, who has given birth to six cubs, is the oldest actively breeding female in captivity.
Her previous cubs Hua Mei, Mei Sheng, Su Lin, Zhen Zhen and Yun Zi are part of the China Conservation and Research Centre for Giant Pandas.