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David Beckham's Son Romeo, Romeo ... Wherefore Art Thou, Bieber???

Justin Bieber caught a tennis match across the pond this weekend ... is what you might think at first glance with this photo. Turns out, it's another young famous guy with JB vibes.

David Beckham's second-oldest son, 17-year-old Romeo Beckham, was out Sunday in London watching pro tennis players Dominic Thiem and Stefanos Tsitsipas face off in the Nitto ATP Finals tournament ... where they were actually playing in the final round.

Romeo had a great view sitting next to a beautiful blonde, and interestingly enough ... he was proudly rocking some Drew gear -- which is Bieber's popular unisex clothing brand.

What's wild is that Romeo is a dead ringer for the Biebs, especially with that beanie on. As we've seen, Justin has rocked a similar style himself -- they could be twins, frankly.

Meanwhile, Justin was very much in L.A. this weekend ... enjoying himself a lazy Sunday with his two Savannah cats, his dog and a whole lot of Drew gear around the house. On Sunday, he kept plugging his line ... and even got around to plugging Kylie Jenner too.

We might have to get a Drew emoji going pretty soon considering how much it seems to be taking off. In the meantime, though, this will have to do ... 😎

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