We just told you EXCLUSIVELY that Ranbir Kapoor and Katrina Kaif exchanged rings in London during their Christmas holiday! Now having seen Kat step out in front of the cameras at Farah Khan's 50th birthday party, we cannot be more sure about the news of RK- Kat’s engagement. Katrina attended the birthday bash sans her beau but she certainly seemed in great spirits! She even smiled for the shutterbugs, something she rarely does. But one thing that caught our eye in all her pictures from the party was her left hand buried in her jeans’ pocket! It seemed as if Kat was trying to hide her hand from the cameras, perhaps she hid her engagement ring under there! Who can tell! Well, there is not a single picture of her from the party wherein her left hand or her ring finger can be seen! It just adds more spark to the reports about her engagement to Ranbir. Do you agree with us guys?