EXCLUSIVE PHOTOS - Katy Perry Has "Bieber Fever" At Lunch

We know "The Biebes" has a thing for older women, but a 27-year-old divorcée might be pushing it!

While ex-hubby Brand was prepping to hit up a tattoo parlor with his new Hungarian model girlfriend, Katy Perry was busy grabbing lunch in Hollywood while showing her love for fellow musician, Justin Bieber, on Saturday afternoon.

The "Firework" singer's T-shirt featured the 18-year-old's Rolling Stone cover, which she wore under a grey hoodie, black pants and a LA Dodgers baseball cap pulled over her eyes to cover her bright blue 'do.

Could Perry be wearing the shirt to support Justin, since "Boyfriend," the first single from his latest album Believe, will be released on Monday?

Selena Gomez, watch out!