Hugh Hefner passed away yesterday at 91 years old.

With a lifetime full of accomplishments, fame, friends and success, it's no surprise so many people have expressed their sadness regarding the Playboy mogul's death—especially the women he employed and worked with over the years.

However, while there were plenty of Playboy bunnies, platinum blondes and models who came in and out of Hefner's life (not to mention, the mansion), there were a select few who were just a little extra special to him.

Hefner was married three times, and though you may not agree with it, he also had several long-term partners who he considered very important women to him, even if he was dating other people at the same time.

Scroll below to see which ladies reigned supreme in the late Playboy mogul's life:

Hugh Hefner, Crystal Harris

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The 31-year-old model was married to Hefner at the time of his death. The couple tied the knot in 2012 after meeting when she covered the December 2009 issue of Playboy. Harris was Hefner's third wife.

Hugh Hefner, Kimberley Conrad

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Conrad is Hefner's second wife. The couple got married in 1989 before separating in 1998. They stayed married for their sons—Marston and Cooper Hefner—until 2010 when they finally filed for divorce.

Christie Hefner, Millie Gunn, Kimberley Conrad, Hugh Hefner

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Williams was Hefner's first wife. The couple married in 1949 and divorced in 1959. They share two children together, his 64-year-old daughter, Christie Hefner, and his 62-year-old son, David Hefner.

Hugh Hefner, Christie Hefner

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The Playboy mogul's one and only daughter—whom he shared with his first wife, Millie—Christie worked for the company for 27 years and held the title of CEO for 21 years. 

Marilyn Monroe, Hugh Hefner

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The blonde bombshell was featured on the cover of the very first issue of Playboy in 1953. Selling around 50,000 copies, the issue catapulted the magazine and Hefner—who started it with a mere $8,000 loan—to success. In fact, he cared so much for Monroe, he will be buried beside her at the Westwood Village Memorial Park in Los Angeles, Calif.

Hugh Hefner, Pamela Anderson

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It's safe to say Hefner made Pamela Anderson a household name when he featured her on the October 1989 cover, and many people would go on to say that she was one of his favorite models of all time. In fact, she graced the final nude issue of Playboyher 14th cover for the magazine—in 2016, before the company reinstated nudity earlier this year. Anderson couldn't control her tears upon hearing the news of his death, penning an emotional poem in his honor.

Kendra Wilkinson-Baskett, Hugh Hefner

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Hefner and the former Girls Next Door star shared a special bond as the model moved into the Playboy mansion at just 18 years old. They dated from 2004 to 2008. However, following their split, Wilkinson went on to marry Hank Baskett, and Hefner actually helped host the wedding at the mansion, sitting second row to support his ex-girlfriend's happy ending. "Hef changed my life," Wilkinson told E! News in a statement. "He made me the person I am today."

Holly Madison, Hugh Hefner

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Another star of Girls Next Door, Madison was known as Hef's "main girlfriend" from 2001 to 2008. In fact, in 2008, the Playboy mogul stated he believed they would be together for the rest of his life. Unfortunately, he never thought that he would marry her, and they broke up shortly after. In 2015, Madison released her book Down the Rabbit Hole: Curious Adventures and Cautionary Tales of a Former Playboy Bunny, which criticized Hefner and the whole Playboy lifestyle.

Hugh Hefner, Bridget Marquardt

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Though they lost contact in recent years, Hefner dated Marquardt from 2002 to 2009. She also starred alongside Wilkinson and Madison on Girls Next Door

Hugh Hefner, Barbi Benton

AP Photo/Bob Dear

Hef dated Benton from 1969 to 1976 after the two met while co-hosting Playboy After Dark together. She would go on to appear on the cover of Playboy four times. 

Hugh Hefner, Mary OConnor

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O'Connor worked as Hefner's secretary and the "mansion mother" for over 40 years. When she passed away in 2013, he tweeted, "Mary passed away today. We loved her more than words can say."

Meanwhile, on Wednesday evening, Playboy announced that Hefner had passed away from natural causes at the Playboy Mansion. 

"My father lived an exceptional and impactful life as a media and cultural pioneer and a leading voice behind some of the most significant social and cultural movements of our time in advocating free speech, civil rights and sexual freedom," his youngest son, Cooper Hefner, shared in a statement. "He defined a lifestyle and ethos that lie at the heart of the Playboy brand, one of the most recognizable and enduring in history."

Cooper continued, "He will be greatly missed by many, including his wife Crystal, my sister Christie and my brothers David and Marston, and all of us at Playboy Enterprises."

Information regarding memorial services are not available at this time.

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