Mumbai, (PTI) Karan Johar has become a single father of twins - a baby boy and girl - who were born through surrogacy and his friends and colleagues from Bollywood have expressed their happiness for the filmmaker.

Johar, 44, has named his daughter Roohi and son Yash, after his late father Yash Johar.

"I am ecstatic to share with you all the two most wonderful additions to my life, my children and lifelines; Roohi and Yash. I feel enormously blessed to be a parent to these pieces of my heart who were welcomed into this world with the help of the marvels of medical science," Johar said in a statement.

The "Ae Dil Hai Mushkil" director says it was an emotional but well thought out decision which he has taken considering all the responsibilities and duties that come with being a parent.

"In order to arrive at this decision, I have prepared myself mentally, physically, emotionally and logistically to ensure that my children get all the unconditional love, care and attention from me and mine. I have submitted to the fact that my children are my world and priority."

Johar says his work, travels and social commitments will have to take a back seat after the arrival of his kids and he is prepared for that.

"By the grace of God, I have the most caring and supportive mother who will be an integral part in the up-bringing of her grandchildren and of course, friends who are family," he says.

Thanking the surrogate, the filmmaker says he is eternally grateful to her as she has fulfilled his "lifelong dream and provided a warm, loving and nurturing environment to my children before bringing them into this world."

Celebrities including Priyanka Chopra, Alia Bhatt and Farah Khan showered their blessings on the new parent and the twins.

"Finally I can say I have a younger brother AND sister!!! So so so happy! So much love to give uff bursting with joy," Alia tweeted.

Priyanka wrote, "Congratulations @karanjohar so happy for you. May Yash and Roohi always have a beautiful healthy life.

Much love always."

Farah posted, "Glad you took my advice seriously @karanjohar Best thing to happen to you... And they'll be the youngest people you hang out with so all's good.