Superstar Aamir Khan is overwhelmed with actor Ranbir Kapoor’s performance in Ae Dil Hai Mushkil, and calls him a great artist. Aamir took to Twitter to laud filmmaker Karan Johar’s directorial venture. Ae Dil Hai Mushkil, also starring Aishwarya Rai Bachchan, Anushka Sharma and Fawad Khan, clashed with actor-filmmaker Ajay Devgn’s Shivaay at the box office. “Just saw Ae Dil…. What a film! I just loved it! Karan has hit the ball out of the stadium. Ranbir, Aishwarya and Anushka have just killed it. Ranbir is the best actor! Period! A must see!” Aamir posted.