On the left, 16-year-old Alyson Hannigan as 16-year-old Jan on Roseanne.
On the right, 25-year-old Alyson Hannigan as 18-year-old Michelle in American Pie.

On the left, 16-year-old Alyson Hannigan as 16-year-old Jan on Roseanne.

On the right, 25-year-old Alyson Hannigan as 18-year-old Michelle in American Pie.