Justin Bieber gave his baby brother a taste of baller's paradise ... docking his yacht for lunch.
The Biebs and his 6-year-old bro, Jaxon, hit up Seaspice in Miami Tuesday for some grub ... pear and Gorgonzola ravioli, short ribs and mojitos ... Jaxon's was virgin.
The tab topped $300 ... and the Biebs made the waiter's day with a $200 tip.
See ... Justin is a role model.
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