No, Lil Uzi Vert has not bought a planet.
While the rapper has expressed interest in space exploration and has even launched his own satellite, there is no evidence to suggest that he has purchased any celestial bodies.
It's important to note that owning a planet is not currently possible under existing international law. The Outer Space Treaty of 1967 explicitly prohibits national appropriation of celestial bodies.
Therefore, it is highly unlikely that any individual, including Lil Uzi Vert, could legally purchase a planet.