Los Angeles: Hollywood star Sean Penn has admitted that he is "surprised to be in love".


Sean Penn on Charlize Theron (Pic/Santa Banta)

In an interview to Esquire, the 53-year-old 'Milk' actor, who is in a relationship with Charlize Theron, said that it has made him realise that he hasn't "been happy in a single relationship" before, reported E! online.