Karolina: Violin Sensation & Viral Brother Birthday Video!

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Karolina's violin skills and diverse song covers made her famous. Surprisingly, her brother Leo's birthday video gained 124M views! We celebrate her 8.4M YouTube subscribers and features on Access Hollywood. #KarolinaViolin #ViolinCovers #ViralVideo #BirthdayCelebration #YouTubeSensation #SocialMediaStar #AccessHollywood #KellyClarksonShow #ViolinSkills #MusicViral