After taking a flight from Tokyo, she tweeted: "After what felt like longest flight ever I'm finally here! Honoured to play Chennai! This is my first performance in India."
The 27-year-old, set to enthrall the audience with her hits like "Fireworks" and "California Gurls", arrived here Monday.
"Almost fell asleep in my curry last night, no joke... Woke up feeling so much better after a fresh meditate... feels appropriate being in India," she tweeted Tuesday.
This is not the first time the singer is visiting India. She tied the knot with now estranged husband Russell Brand in a traditional Hindu wedding ceremony in India in October 2010.