He has attracted a slew of mostly younger female fans over the course of his fledgling music career.
But it seems Justin Bieber has a new famous 'Belieber' in his ranks of admirers.
Katy Perry yesterday stepped out proudly sporting a sleeveless T-shirt with the 18-year-old pop star's face on it.
Katy wore the T-shirt, which is a print of the singer's Rolling Stone cover, under a casual grey hoodie and black trousers for lunch with friends in Hollywood.
She kept her look low key with a blue baseball cap pulled over her eyes, and oversized sunglasses.
The singer has recently returned from Germany where she put in an energetic performance of her latest hit Part of Me.
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