By Alli Rosenbloom, CNN

(CNN) — Keanu Reeves was the unlikely but seemingly enthusiastic co-star of Jonathan Groff’s performance at the Tony Awards on Sunday.

Groff appeared on stage in a sparkly tuxedo to perform “Mack the Knife,” a song from the Tony-nominated musical “Just In Time,” in which he stars as Bobby Darin.

Toward the beginning of the lively performance, Groff hopped off the stage and into the audience. After doing so, he ran up to Reeve’s chair, climbed onto it and straddled Reeves, standing with one foot on each armrest.

Groff sang his song as Reeves looked into the camera with wide eyes and at one point, reached down to caress Reeves’ chest and face.

Reeves seemed to be all in on the bit, pumping his fists and giving the universal sign for rock ‘n’ roll with his ha

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