WATCH: Kylie Jenner breaks down in tears as sister Kendall recalls her 'biggest insecurity'

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Kylie Jenner recently cried with sister Kendall Jenner about her sister’s struggles with acne she experienced during high school.

The social media guru and billionaire businesswoman, 23, got emotional with her sister, Kendall, on Kylie's latest YouTube video “Drunk Get Ready with Me: Kylie and Kendall,” which has gained over 3.6 million views in one day.

"I knew it was your biggest insecurity and every time like clockwork we would get out of the car [at school], you would pull me into the staircase and you would say, 'How do I look today?'" Kylie, 23, recalled while wiping away tears.

"It always made me so sad to even hear you talk about it. I'd be like, 'You're so beautiful,' trying to help. But then I had to go away by myself. It makes me feel bad. When you have your own daughter you just think about this," Kylie added, who is mother to three-year-old Stormi Webster.

In the video, the pair took shots of Kendall’s new 818 Tequila while applying full glam make-up looks from Kylie's makeup line "Kylie Cosmetics."

In the past, Kendall Jenner has been open about her skincare struggles and acne-related anxiety. In the video, she admitted that she began wearing makeup at an early age to hide her breakouts.

"I would have so much acne. Every morning we would show up to school. Dad would drop us off and we'd be walking up the stairs. I'd look at you and I'd be like, 'Can you see my acne?'" Kendall remembered. Kylie replied, "I know, I know."

The 25-year-old model revealed that she was thankful to have her younger sister by her side.

"Every day you would say, 'No you look beautiful.' I would be like, 'Okay.' I knew you were lying but I appreciated you," Kendall said.

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