Ae Dil Hai Mushkil might have opened to mixed reviews but one actor who is gaga over the film and Ranbir Kapoor is none other then Aamir Khan. Yes, the actor was so overwhelmed by Ranbir's performance that he tweeted: ...Ranbir, Aishwarya and Anushka have just killed it. Ranbir is the best actor! Period! A must see!