Pop princess Ke$ha was joined on stage last night, July 5, by a very special guest. 

The 'Tik Tok' singer performed in Norway yesterday and veteran rocker Alice Cooper walked out in front of the crowd to sing a rendition of his classic hit, 'School's Out', with her. 

Writing about the exciting collaboration on her official Twitter page this morning, Ke$ha thanked the star for the opportunity to perform with him:

"@RealAliceCooper ur the best. Wish I could see u with maiden tonight!!!! Fuuuuck"

He then replied, "thanks @keshasuxx! Next time our stage, and be sure to bring some bandaids..."

Watch fan-recorded footage of the pair's duet here: