The 'Real Love' hitmaker insists she isn't ''psychotic'' but if she had the chance to be invisible, she would use her new-found super-power to spend a day with her idol.
She said: ''If I was invisible for a day, I'd probably follow Beyonce around as she's my hero.
''I wouldn't break into her house or anything - I'm not psychotic.''
As well as Beyonce, Jess was also a big admirer of late singer Amy Winehouse and sleeps beneath a picture of the 'Rehab' star.
She said: ''Recently, I was given a big picture of Amy Winehouse in a cool frame from my parents.
''She's very inspirational to me, so I've hung it above my bed.''
Though Jess has just released her debut album 'I Cry When I Laugh', she admits she found it hard to sign off on the finished record because she is such a perfectionist.
She told heat magazine: ''I'm a perfectionist, so if something isn't how I want it to be, or it doesn't feel right, I beat myself up over it.
''It was hard letting go of my album and accepting it was finished.''
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