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\"Sometimes you need a disguise to watch the best show on earth and that’s just how it is,\" wrote Kahan, adding, \"Endlessly honored to have joined you last night @oliviarodrigo.\"

The post shows the pair in three photos, the last of which reveals Kahan in the blond wig he wore alongside an Olivia Rodrigo sweatshirt, cleverly masking himself as a fan.

\"[Y]ou’re the best in the biz Noah!!!!! last night was the most fun❤️❤️❤️❤️❤️❤️❤️,\" commented Rodrigo on the post.

Rodrigo shared an Instagram post capturing the moment Kahan joined her on stage for their \"Stick Season\" duet. \"[S[tick season at madison square garden 🥹. @noahkahanmusic is the greatest of allllll time !!!!!!\" wrote Rodrigo in the caption.

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