Katy Perry's Huge Surprise For Brooklyn

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John Mayer and Katy Perry's "Who You Love" duet has us completely convinced that those two kids are super-duper, in-your-face, head-over-heels into each other. But, in case you had any lingering doubts, consider Tuesday's events. Mayer performed at the Barclays Center (Beyoncé must have been busy) — and, much to his fans' delight, Perry joined him on stage for a guest performance. It should come as no surprise that the audience kind of freaked out. Luckily, one fan was calm enough to catch it on camera. Cue the aww, you guys. Mayer and Perry really are in love. Can you imagine how totally and ridiculously cute their babies will be? Let's just hope we get an invite to the star-studded nuptials. (Just Jared)

Photo: Tom Dymond/Thames/REX USA.