Katy Perry did not write 'Part of Me' about Russell Brand.

With lyrics like, ''You can keep the diamond ring - it don't mean nothing anyway,'' fans assumed the song was about her divorce from the 'Arthur' star.

But the 27-year-old singer insists she wrote the track years before Russell filed for divorce after just 14 months of marriage in December - although she acknowledges its relevance.

She said: ''I wrote 'Part of Me' two years ago and I always knew that 'Part of Me' was a special song.

''It feels like my life plays out with these songs. I feel like I'm in some kind of weird 'Truman Show' where I'm like, 'Why is this single appropriate now and it wouldn't have been appropriate then?' It's just so crazy.

''I guess the universe is kind of - we're kind of like, dancing together in some weird way.

''Does that make sense or am I being too hippie? I think it's really important for me to write songs that are still honest and relatable because that's what everyone else is going through.''

Meanwhile, the blue-haired beauty has teamed up with EA for new computer game 'The Sims 3 Showtime Katy Perry Collector's Edition'.

She told Access Hollywood: ''If you don't like sweets, this may not be your thing. But, you know, it's larger than life and it's pure fun and that's kind of how I roll in real life too.''