Kartik Aaryan surprised fans by joining singer Himesh Reshammiya on stage during his Mumbai concert. In a playful moment, Himesh jokingly asked Kartik, 'Regular Gau Yaa Naak Se?' prompting a fan to shout, 'Naak see!' The singer then performed the title track of Kartik’s movie 'Tu Meri Main Tera Main Tera Tu Meri', delighting the audience with the duo’s lively interaction.