This is gonna sound weird, but I have it on good authority that this is a genuine tiny spaceship, that also doubles as a vase.
Apparently the aliens thought these decorations, with all the colour and sparkle and the little butterflies at the "windows" would serve as camouflage to infiltrate our world without attracting attention.
Obviously they have no idea how things work here, but nice try.
Rest assured, the spaceship is no longer inhabited by aliens.
It is now being offered as a souvenir, art object, floral display unit.