Kourtney shared a nostalgic throwback video on Instagram on Sunday, December 22 of her, Kim, and Khloé from their younger years. The video features the trio performing Tiffany's iconic '80s hit "I Think We're Alone Now."

Long before Keeping Up With the Kardashians turned Khloé, Kim and Kourtney Kardashian into celebrities, the sisters were clearly headed for stardom—as one recently unearthed video revealed. Kourtney took to Instagram on Sunday,

Kourtney Kardashian recently shared a throwback clip where she and her sisters Kim and Khloé all dressed up and dancing to "I Think We're Alone Now" by Tiffany. The eldest Kardashian playfully hinted at the true standout among them,