Actors Dino Morea and Arjun Rampal have wished her a year full of happiness, luck and love.
Preity, who made her Bollywood debut in the 1998 film "Dil Se.." followed it up with a role in "Soldier" the same year. She received a Filmfare Award for Best Female Debut, and was later recognised for her role as a teenage single mother in the 2000 film "Kya Kehna".
The actress received the Filmfare Award for Best Actress in 2003 for her role in the romantic drama "Kal Ho Naa Ho". She also played two the lead role in two consecutive annual top-grossing films "Koi... Mil Gaya" and "Veer-Zaara".
She was later lauded for her portrayal of an independent, modern Indian women in "Salaam Namaste" and "Kabhi Alvida Naa Kehna".
Her first international film role was in the Canadian film "Heaven on Earth", for which she was awarded the Silver Hugo Award for Best Actress at the 2008 Chicago International Film Festival.
Here's what the celebrities tweeted on her birthday:
Abhishek Bachchan: Happy birthday to one of my maddest and dearest friends. @realpreityzinta never change. Stay the gem you are. Big love Z!
Karan Johar: Happy birthday @realpreityzinta! Stay as glorious, positive and zestful as you always are! Big Love.
Sushant Singh Rajput: Happy birthday @realpreityzinta... Your big, big fan!
Alia Bhatt: Happy birthday to the super super fun @realpreityzinta big, big hug always!
Huma Qureshi: Happy birthdat pretty, pretty fun @realpreityzinta ... Stay blessed stay lovely...always... Mwahhh.
Arjun Rampal: Happy birthday darling PZ @realpreityzinta wish you all the happiness and a world filled with all the ting's you love so much. Ting.
Kriti Sanon: Happy birthday to the always smiling girl wid a dimple! @realpreityzinta love the way you are! Mmuaahh!
Dino Morea: @realpreityzinta Pzzz, happiest birthday to you. Have a superb year ahead, love always.