Katrina calls 'Papa' to this senior actor

Everyone was shocked when Katrina Kaif in a party said 'PAPA' to a senior actor. Senior actor is no other but Ranbir's kapoor Father Rishi Kapoor. According to an English paper, in a party when Ranbir and Katrina together reached there and then Katrina hugged Rishi Kapoor and asked 'Aap kaise hai Papa'. Now after seeing this their relationship is in a active mode. Ranbir and Katrina are in live in relationship since 1 year.