Kendra Wilkinson and Bridget Marquardt, two of the three stars of "Girls Next Door," the E! reality show that focused on Hefner's girlfriends from 2005 until 2010, expressed their sentiments in an Instagram post.
"So sad but forever grateful for all the wonderful memories and amazing experiences," Marquardt wrote.
Added Wilkinson: "Can't really put in to words how I really feel. It's easy to say he will be missed and how much I loved him. There's a lot more than that."
Thank you for all of your thoughts and condolences guys.— Kendra Wilkinson (@KendraWilkinson) September 28, 2017
Can't really put in to words how I really feel. It's easy to say he will be missed and how much I loved him. There's a lot more than that— Kendra Wilkinson (@KendraWilkinson) September 28, 2017
Pamela Anderson, who appeared on the cover of Playboy 14 times, shared a video on Instagram that featured her crying as she said a final goodbye to the magazine publisher.
"I am me because of you. You taught me everything important about freedom and respect. Outside of my family, you were the most important person in my life. You gave me my life," she wrote in a lengthy caption. "I'm in such deep shock. But you were old, your back hurt you so much. Last time I saw you, you were using a walker. You didn't want me to see. You couldn't hear. You had a piece of paper in your pocket you showed me - with my name Pamela with a heart around it.
"Thank you for making the world a better place. A freeer and sexier place," she continued. "You were a gentleman: charming, elegant, chivalrous and so much fun."
Other celebrities who spoke out about Hefner included:
Actress and former Playmate Jenny McCarthy
RIP #Hef Thank you for being a revolutionary and changing so many people's lives, especially mine. I hope I made you proud. ??#PMOY 94 ?? https://t.co/sF9ARYgEpw— (@JennyMcCarthy) Sep 27 2017
Actress and former Playmate Donna D'Errico
Hugh Hefner put me in Playboy & ignited my career. I am forever indebted, Hef. You will forever live on as an icon of epic proportions. #RIP— (@DonnaDErrico) Sep 27 2017
Hall of Fame sports announcer Michael Buffer
Reality TV star Kim Kardashian West
RIP to the legendary Hugh Hefner! I’m so honored to have been a part of the Playboy team! You will be greatly missed! Love you Hef! Xoxo— Kim Kardashian West (@KimKardashian) September 28, 2017
Comedian Richard Lewis
RIP HF. Few did more for writers, inc myself, breaking boundaries and helping Lenny fight for his 1st Amend Rights. pic.twitter.com/Vi4iDgYdCn— Richard Lewis (@TheRichardLewis) September 28, 2017
Musician Gene Simmons
Model and reality TV star Adrianne Curry
I just found out @hughhefner died. Thank u for the time together, 2 covers& artistic freedom on my second shoot. you believed in my vision— Adrianne Curry (@AdrianneCurry) September 28, 2017
Reality TV star Heidi Montag
Singer Aubrey O'Day
Actor Rob Lowe
I had a number of great conversations and with Hugh Hefner. Was such an interesting man. True legend. What an end of an era!— Rob Lowe (@RobLowe) September 28, 2017
Civil rights activist the Rev. Jesse Jackson Sr.
Hugh Hefner was a strong supporter of the civil rights movement. We shall never forget him. May he Rest In Peace. pic.twitter.com/oL3lKLZRQ5— Rev Jesse Jackson Sr (@RevJJackson) September 28, 2017
Singer and actress Nancy Sinatra
One of the nicest men I've ever known. Godspeed, Hugh Hefner. pic.twitter.com/457cchqskO— Nancy Sinatra (@NancySinatra) September 28, 2017
Actor Mark Hamill
"Live! With Kelly" co-host Ryan Seacrest
Rest in peace #HughHefner - he will forever be remembered as the Hollywood legend who lived life to the fullest.— Ryan Seacrest (@RyanSeacrest) September 28, 2017
Reality TV star Paris Hilton