Karan Johar's birthday brought SRK, Ranbir, Katrina amongst other stars under one roof [INSIDE PHOTOS]

Bollywood filmmaker Karan Johar turned 45 on May 25 and invited the entire film industry to his birthday bash in Mumbai. Shah Rukh Khan, Aishwarya Rai Bachchan, Akshay Kumar, Aamir Khan, Hrithik Roshan and Sanjay Dutt attended the grand party.

Other young stars like Alia Bhatt, Varun Dhawan, Sidharth Malhotra, Anushka Sharma, Ranbir Kapoor, Katrina Kaif, Deepika Padukone and Arjun Kapoor were also seen at the event. In fact, the star kids and upcoming Bollywood actors like Sara Ali Khan, Jhanvi Kapoor and Aryan Khan had also arrived to celebrate Karan's birthday.

The star studded affair not only had the glam-factor, but also grabbed a lot of attention when exes and rumoured couples came to the party.

The bash saw Katrina, Deepika and Ranbir, and we wish people could have gotten a sneak peak about such social gatherings. Varun arrived with girlfriend Natasha Dalal, while rumoured love birds Sidharth-Alia too came together.

All the celebs from Bollywood attended the party, except Kangana Ranaut, Kajol and Salman Khan. There were reports that Salman didn't attend due to Aishwarya's presence, and Kangana-Kajol's cold war with KJo is the reason not to attend the party. On the other hand, best friend Kareena Kapoor Khan was also missing from the event.

Take a look at some inside photos which will help to figure out what happens in star studded parties:

Check out the slideshow for more photos: