The trailer of Sidharth Malhotra starer film 'A Gentleman' was released yesterday and looks like his mentor Karan Johar is loving Sidharth's action-romantic film. The filmmaker reacted to the trailer on Twitter. While his other 'Students' Alia Bhatt and Varun Dhawan too reacted to the trailer. Alia Bhatt plainly reacted with 'love struck' emoticons stating that the lady is in love with the trailer.