Mourners yesterday wept beside the tiny white casket of 4-year-old Ariel Russo, who was killed by a driver fleeing cops on the Upper West Side last week.

Her coffin was adorned with carnations during a service at a Queens chapel.

She was walking with her grandmother to school Tuesday when an SUV allegedly driven by Franklin Reyes, 17, hit them.

Ariel’s funeral is set for 10 a.m. today.