Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Grinning cheekily in his father’s arms, Prince George can’t resist monkeying around in this previously unseen photograph issued to mark his second birthday tomorrow. The picture was taken by celebrated fashion photographer Mario Testino at his little sister Princess Charlotte’s christening earlier this month. The snap shows doting father Prince William and his son in the gardens at Sandringham House, the Queen’s private residence in Norfolk. William, who recently described his lively son as a ‘little monkey’, looks on with pride as George, who is third in line to the throne and was born at the private Lindo Wing at St Mary’s Hospital on July 22 2013, gazes adorably into the camera.Image shows a very smiley Prince George leaning towards the cameraPhotographer Mario Testino captured image at Charlotte's christeningLast year he had party at Kensington Palace with Queen as guest of honourThis time he will celebrate his birthday at Anmer Hall in Norfolk 
 Question:They are very pleased to share this picture as they celebrate _'s second birthday.

Prince George