Demi Lovato kicks off her world tour tomorrow with Christina Perri and MKTO, which is incredibly exciting for fans who grew up watching Demi and Tony Oller on Disney Channel's As the Bell Rings. The stars, who are now strictly singers, were really good friends back in the day and we're incredibly excited that the former co-stars are reuniting on the road.

Since it's Flashback Friday, we decided to celebrate the start of the Demi World Tour with mind-blowing old pics of Demi and Tony hanging out. Click through, then let us know in the comments below which pics you love the most.

Love J-14? Be sure to subscribe to our YouTube channel for fun, exclusive videos with your favorite stars.