09/28/2017 09:55 EDT | Updated 09/28/2017 12:12 EDT

'The Girls Next Door' React To Hugh Hefner's Death

But one former girlfriend hasn't shared her condolences... yet.

Getty Images for AFI
Hugh Hefner arrives with

The news of Hugh Hefner's death at the age of 91 has made many of us think of his legacy, not least of which was his groundbreaking — and often controversial — magazine, Playboy.

But one area in Hef's wheelhouse that's often overlooked is the mark he left on reality television, specifically, the E! series "The Girls Next Door."

The TV series originally aired from 2005 until 2010, and was co-created by the Playboy founder.

The first five seasons starred Hef's three main girlfriends, Holly Madison, Kendra Wilkinson, and Bridget Marquardt, while the sixth and final season focused on Hef's new girlfriends, twins Kristina and Karissa Shannon, and a then-23-year-old Crystal Harris, who would eventually become his third wife.

Holly Madison, Hugh Hefner, Bridget Marquardt and Kendra Wilkinson. (Denise Truscello/WireImage)

On Thursday, both Wilkinson and Marquardt posted reactions to their ex-boyfriend's death.

Via Twitter, Marquardt posted a picture of her and Hef in better times, writing, "So sad but forever grateful for all the wonderful memories and amazing experiences #RIPHef #Playboy 💔."

In a statement, Wilkinson said: "Hef changed my life. He made me the person I am today. I couldn't be more thankful for our friendship and our time together. I will miss him so much but he will be in my heart forever."

Charley Gallay/Getty Images for Playboy
Hugh Hefner and Crystal Hefner attend Playboy Mansion's Annual Halloween Bash on October 25, 2014 in Los Angeles. (Charley Gallay/Getty Images for Playboy)

As of press time, Madison has yet to post a reaction on her social media channels or through a statement, however, in her 2015 memoir Down the Rabbit Hole, the "Holly's World" star criticized Hefner's treatment towards her and his other girlfriends, claiming that all the girlfriends were expected to sleep with the Playboy founder and that he would pit them against each other.

Hugh Hefner and Holly Madison arrive at Spike TV's 2nd Annual Guys Choice Awards on May 29, 2008 in Los Angeles. (Jeffrey Mayer/WireImage)

Despite these allegations, many of Hef's ex-girlfriends, friends, and Playmates shared their condolences on social media.

Pamela Anderson, who made the cover of Playboy a whopping 14 times, shared her grief on Instagram, posting a video of her crying and whispering, "Goodbye, Hef," along with a poem about her love and respect for her friend.

Goodbye #Hef Mr Hefner I have so many thoughts, I have no brain n right now to edit 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... People tell me all the time That I was your favorite... 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. Now, I'm falling apart. This feeling is so crazy. It's raining in Paris now. I'm by the window. Everything anyone loves about me is because you understood me. Accepted me and encouraged me to be myself. Love like no one else. Live recklessly With unfiltered abandon. You said the magazine was about a girl like me. That I embody the spirit you fantasized about. I was the one. You said. I can hear you say - Be brave. There are no rules. Live your life I'm proud of you. There are no mistakes. And with men - Enjoy ... (Your wonderful laugh) You have the world by the tail You are a good girl And you are so loved - You are not crazy. You are wild and free Stay strong, Stay vulnerable. ... "It's movie time" You loved my boys ... You were always, always there for us. With your love Your crazy wisdom. I will miss your everything. Thank you for making the world a better place. A freeer and sexier place. You were a gentleman charming, elegant, chivalrous And so much fun. Goodbye Hef ... Your Pamela 💋

A post shared by The Pamela Anderson Foundation (@pamelaanderson) on

"Outside of my family, you were the most important person in my life. You gave me my life... People tell me all the time that I was your favourite," Anderson wrote.

"Everything anyone loves about me is because you understood me. Accepted me and encouraged me to be myself," she added.

Kim Kardashian, who appeared on the cover of Playboy in 2007, also spoke out on Hefner's death, writing on Twitter:

Family friend Paris Hilton shared her sadness over his death on Facebook:

Others followed suit, including former Playboy model Carmen Electra:

And Jenny McCarthy:

As of press time, Hefner's wife, Crystal Hefner, has yet to make a statement about her husband's death.

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