Kelsea Ballerini and Chase Stokes do “Grease” in epic Halloween couple costume

Kelsea Ballerini and Chase Stokes give you goosebumps — and counting — in their “Grease”-inspired Halloween couple costume. The lovebirds attended Heidi Klum’s annual Halloween party in New York City on October 31, dressed as John Travolta and Olivia Newton-John’s…