Johar, who popularised the occasion with his 1998 blockbuster "Kuch Kuch Hota Hai", wrote, "Friendship is an underrated relationship... It actually is the biggest strength to have... True friends are more than family... #FriendshipDay."
"Happy Friendship Day! To all my fans and friends, thank you for all the love and support," Madhuri said.
Actor-filmmaker Farhan, who directed the 2001 coming-of-age film about three best friends, "Dil Chahta Hai", while wishing his fans, tweeted, a real friend is that mirror which does not lie while showing your true identity.
"Happy friendship day. As I say, friends are the family we choose. Thankfully I am blessed with many. To all my friends, cheers and thank you," actor Arshad Warsi tweeted.
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Anupam Kher wrote, "Friendship is a sheltering tree. #HappyFriendshipDay to all of you."
"Vicky Donor" star Ayushmann Khurrana, giving tribute to "Kuch Kuch Hota Hai", said, "Pyaar Dosti hai. #FilmyFriendshipDay #KKHH."
Actress Sushmita Sen tweeted, "Happy Friendship Day Beautiful people! Thank you for your wishes, and more so for being friends for all weathers and all heart. I love u guys..."
"Special something for all you lovely people out there who've stood by me from the start! #HappyFriendshipDay," said actress Aditi Rao Hydari.