For years, Holly Madison and Kendra Wilkinson seemed to be part of a secret sisterhood. But a lot has changed since the women ended their relationships with Hugh Hefner, and the former stars of “The Girls Next Door” have opened up about what life was really like at the Playboy Mansion.

Madison and Wilkinson have been trading barbs since writing their dueling memoirs, with Wilkinson recently saying Madison published her new tell-all book, Down the Rabbit Hole: Curious Adventures and Cautionary Tales of a Former Playboy Bunny, for “revenge.”

Madison has her own view. In the above clip from her upcoming interview on “Oprah: Where Are They Now?,” she discusses how her relationship with Wilkinson has changed over the years.

“Kendra’s and my relationship has definitely been weird,” Madison says in the above video. “I feel like, over the years, I’ve known like three different people.”

When they first met, Madison says Wilkinson “started off as this girl who seemed nice.”

In 2005, “The Girls Next Door” premiered to huge ratings on E! and Madison and Wilkinson became household names. The breakout hit focused on lives of Hefner’s then-girlfriends, Madison, Wilkinson and Bridget Marquardt. For five seasons, cameras documented the drama that unfolded inside the Playboy Mansion walls.

Madison says Wilkinson changed into “this girl who’s not a girl’s girl and is very competitive and pushes away other girls.”

By 2009, all three women had left the mansion and ended their relationships with Hefner. Wilkinson married former wide receiver Hank Baskett in 2009 and Madison went on to marry Pasquale Rotella in 2013.

“When she met her husband she was very nice and seemed to have grown into this really different person,” Madison says.

But once again, their friendship didn’t last. “And then later down the road we had a falling out, so it’s been all over the place,” she says. “I want viewers to pick up the book and read the whole story.”

Madison’s memoir, Down the Rabbit Hole: Curious Adventures and Cautionary Tales of a Former Playboy Bunny, is available now.

“Oprah: Where Are They Now?” airs Saturdays at 10 p.m. ET on OWN.

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