Karan Johar is known for his lavish birthday bashes and recently, the filmmaker celebrated his 42nd birthday. Though the party, this time around, was a little hush-hush compared to the other ones, many Bollywood stars made it to the bash to give their best wishes to the star. Kiran Rao who has started bonding with Karan of late, came to the party with her hubby Aamir Khan. <BR><BR><BR><br><p class=clear>&nbsp;</p><amp-img width=1.33 height=1 layout=responsive src=https://images.bollywoodhungama.com/img/feature/14/may/kjobday1b.jpg></amp-img><BR><BR><br><p class=clear>&nbsp;</p>The other couple was the Disney India head honcho Siddharth Roy Kapur and his actress wife Vidya Balan. Putting an end to the rumours of pregnancy, Vidya boldly gave a glimpse of her midriff in the long kurta while her hubby managed to keep it simple with his casual attire.