Katrina was photographed in her car as she left for the party.
On Instagram, fan clubs shared pictures from the celebration.
Actors Alia Bhatt, Arjun Kapoor, Sidharth Malhotra and Aditya Roy Kapur arrived for the party. With Sidharth, Katrina will soon be seen in Baar Baar Dekho while she worked with Aditya in Fitoor which released in February this year.
The director's corner included Katrina's Ek Tha Tiger director Kabir Khan, who arrived with his wife Mini Mathur. Karan Johar, Vikas Bahl and Ritesh Sidhwani were also there.
It's time for a group selfie.
Happy Bday Katrina pic.twitter.com/WahiHQKd0u? Kabir Khan (@kabirkhankk) July 15, 2016
So much love:
Meanwhile, Karan Johar shared a picture of the men in white - Aditya, Abhay Deol and Sidharth looked handsome.
Katrina Kaif was last seen in Fitoor which released in February this year. She will soon be seen in Jagga Jasoos with Ranbir Kapoor, apart from Baar Baar Dekho.