Ranbir Kapoor, the handsome hunk is on shoot for 'Ae Dil Hai Mushkil' in London. In his tight schedule, this smart young man celebrated his birthday. This birthday might be his best birthday. Do you know why? The Bollywood Badshah Sharukh Khan entered the sets of 'Ae Dil Hai Mushkil' on the birthday of Ranbir. This was a sweet surprise for Ranbir and the director Karan Johar, who is one of the closest buddies of Sharukh. What else could be the best treat for Ranbir on his birthday than the visit of India’s Super Star! Actually, it was the wish of both Ranbir and Karan to meet Sharukh. So, Sharukh surprised them by visiting them without prior information. 'Ae Dil Hai Mushkil' has Aishwarya Rai Bachchan and Anushka Sharma along with Ranbir Kapoor.