Katy Perry says that she is determined to stay "true" to herself as she grows older.

The popstar, who made the world sit up and take notice with her debut hit single 'I Kissed A Girl' in 2008, explained, "It's still me underneath all this. I tried to stay as true to myself as possible - I think that resonates with fans of my music." 

Perry continued, "I'm maturing as a person but I'm still as cuckoo and crazy as I've always been. Irony and sarcasm and things that could be considered wrong make me laugh. Crossing the line is definitely healthy."

Her third and latest album, 'Teenage Dream', has topped the album charts in five countries.