"Oh my god," Wynonna Judd mouthed as she hugged John Fogerty, before performing 'Proud Mary' alongside him during the 'Girls Night Out' ACM special on Friday night.

'Proud Mary' had the entire MGM Grand Garden Arena crowd on their feet, and proud mama Naomi Judd clapped along at the side of the stage -- and even took pictures.

Truthfully, it was hard to tell who was a bigger fan of who as the country legend and rock icon shook the building with the Creedance Clearwater Revival staple -- both Wynonna and Fogerty seemed delighted to stand side by side to duet.

Fogerty, who penned 'Proud Mary' for his band back in the late 60s, was one of a handful of male performers invited to the event, which honored the spectacular women of country music. The Judds were recognized for being ACM's most award-winning female duo of all time, with seven Vocal Duo of the Year trophies, as well as Song of the Year in 1984 for 'Why Not Me.'

Wynonna Judd and John Fogerty Rock 'Proud Mary' at 'ACM Girls Night Out'