LONDON: The ‘We Can’t Stop’ singer is a firm believer in the saying ‘what goes around comes around’ and thinks she must have been a saint in her past life because she has been so lucky in this one.  Speaking on British TV show ‘Daybreak’ on ITV, she said: ‘’I’ve been lucky because the universe has done something right for me, karmically it’s always been really good to me. I must have done something right in my past life. ‘’Personally I believe in karma because I’ve seen it bite so many people.’’  The 20-year-old starlet also claims her ability to remain humble and gracious at all times.–ES