Kelly Osbourne opened up about her battles with drugs and alcohol on Wednesday's edition of Jada Pinkett Smith's show "Red Table Talk."

During the new episode, Osbourne told hosts Pinkett Smith, Willow Smith and Adrienne Banfield-Norris that her relapse after nearly four years of sobriety was triggered by the sight of a couple drinking champagne.

"I was alone, sitting by a pool and waiting for somebody to come have a meeting with me. And I saw this woman and her husband had a glass of champagne. It looked really nice, and I was like, ‘I can do that, too,’” she explained. "And the next day, I had two glasses. And the day after that, it was bottles.”

Osbourne, the daughter of rocker Ozzy Osbourne and TV personality Sharon Osbourne, first publicly revealed her relapse in April.

At the time, she said she was disclosing the personal news to her fanbase because she wanted to be transparent. "This is a little hard for me to talk about, but I've always promised you that I will always be honest with you about where I'm at and what's going on in my road to recovery," she said at the time. "I relapsed ... not proud of it, but I am back on track."

During her appearance on "Red Table Talk" Osbourne spoke more about the origins of her opiate addiction, which she said started at the tender age of 13, when a doctor prescribed Vicodin to her after surgery to relieve "a bad case of tonsillitis."

"That was all I needed,” recalled the TV personality, who is now 36.

"I went from having every voice in my head being like, 'You're fat, you're ugly, you're not good enough, no one likes you, you don't deserve this, [and] people only like you because of who your parents are' and, all of a sudden, every single voice was silenced and it felt like life gave me a hug," she said.

"And then, very quickly, it went from Vicodin to Percocet, from Percocet to heroin, eventually, because it was cheaper,” she said.

Osbourne’s episode of "Red Table Talk" airs on Facebook Watch on Wednesday at 12 p.m. ET.

Read more about why she decided to open up about her relapse publicly here.