Rangers hadn't won at Celtic Park since the season after he left Ibrox, and Kris Boyd was like a dog with multiple appendages as he provided punditry on today's triumph.
The former striker, who scored 138 goals across two spells with the Gers, was fuming at half-time as Celtic grabbed an equaliser through a deflection of Odsonne Edouard's hand.
Nikola Katic won it for Rangers in the second half though, and Boyd couldn't hide his delight at full-time.
The sight of the former Scotland international drew a big response from Gers fans on social media.
@paterson_c: Fair play to Kris Boyd today...just about gets his Rangers points back...
@gmcgaughey: Boyd has restored his his status as a legend. The passion and love for rangers was all to see this afternoon.
@fraserMD10: kris boyd was phenomenal today
@allanweir3100: Kris Boyd trolling for fun today
@rachaeljade: Kris Boyd has been top quality today
@thiepalwood: Might lift my self imposed exile on all speakers nights involving Kris Boyd
@kanea7: Kris Boyd absolutely in his element in that studio right now, very much a fan of this version of Boyd
