Beat heavy cream in large bowl with electric mixer on medium-high speed until stiff and soft peaks form. Beat in vanilla. Reserve 3/4 cup for topping. Stir 3/4 cup hazelnut spread in medium bowl until smooth. Stir into remaining whipped cream until combined. Spoon evenly into graham cracker crust.
Spread reserved whipped cream over center of pie to within 1-inch of edge. Place 1 tablespoon hazelnut spread into corner of small resealable plastic bag. Microwave on HIGH 10 seconds or until soft. Cut a small corner off of bag. Drizzle over top. Chill 2 hours.