Katy Perry surprised the audience at her Los Angeles concert by bringing Rebecca Black on the stage for a special performance of Last Friday Night (T.G.I.F.). The unexpected duet was very nostalgic, and it took fans back to 2010, when Rebecca made a cameo in the song's official music video.The performance immediately went viral, with fans being super excited and sharing their love and appreciation on social media. Many called it a "legendary crossover".Fans also praised Rebecca Black's journey, of how she grew from a teenage girl to an artist who has depth. Clips of the performance are all over X, Instagram, and TikTok, and fans are very happy with this. A fan commented by saying,"This performance just unlocked a core memory for an entire generation"@Yola_Flimes's comment on Katy Perry and Rebecca's live performance - via XKaty Perry Shocks Fans by Bringing Rebecca Black on StageThe social media literally exploded with reactions as fans shared their excitement, disbelief, and the way they felt so happy with this surprise. Some simply couldn't believe that they had witnessed this iconic reunion.Another fan commented,“I’m screaming! The ‘Friday’ nostalgia is real. Imagine hearing that live.”@sweetcaseyx's comment on XAnother fan was way too emotional and commented,“i love seeing people getting mad over two long time friends singing a song together !!.”@katysroulette's comment on XAnother fan appreciated their performance and commented,"kinda insane pop lore. rebecca went viral with friday then featured in the thank god it’s friday music video and now they’re both kinda doing hyperpop stuff sjdjskjsj"@arxhiiie's comment on XiHeartRadio Z100's Jingle Ball 2024 Presented By Capital One - Show - Source: GettyTruly, it is amazing to see how insanely fans are reacting to this duo. Some are even saying they should release a new song together. If this is the reaction just for a special appearance, we are left to wonder how excited fans will be if Perry drops a new song with Rebecca Black.Katy Perry Made it a Night to RememberAs clips from the performance continue to circulate, fans are calling it one of the best and most memorable moments in the history of pop music.Perry's songs are always loved, and her decision to bring up Rebecca received lots and lots of love. Fans talked about how Katy has always been all about female support. Mostly, it just brings flashbacks from the original music video, which in itself is quite iconic.