Lonzo Ball's 15-year-old brother, LaMelo, unleashed an sneak water balloon attack on two girls in bikinis -- INSIDE the Vegas home where he's staying -- while wearing a shirt with his own face on it.
Yep.
It all went down Sunday night -- and yeah, Lonzo was inside the home as the water fight broke out. It was a mess. Water everywhere. Ketchup. Craziness.
Unclear if Lonzo is footing the bill for the pad (probably, since he's the only one getting a paycheck) -- but he didn't seem to care as his 15-year-old lil bro destroyed the house.