Comedy about four aliens taking over the world

Here's a possibility:

Morons from Outer Space (1985)
From Wikipedia:
The story begins on a small spaceship docking with a refueling station. On board are a group of four aliens, Bernard, Sandra, Desmond, and Julian. During a particularly tedious period of their stay at the station, the other three begin playing with the ship’s controls while Bernard is outside playing spaceball. They accidentally disconnect his part of the ship, leaving him stranded while they crash into a large blue planet close by (Earth).
The aliens become instant celebrities on arrival, despite being able to bring no great revelation or technical ability to the people of Earth (as is central to the plot of many "aliens on Earth" films). They find a manager (Jones) and become wealthy more or less overnight, packing fans in auditoriums just to see them. Meanwhile, Bernard arrives on Earth via other means of transport. Despite being by far the most intelligent of the group, Bernard is not afforded any celebrity, and is in fact condemned to vagrancy and a brief stint in mental hospital before reuniting with his fellow travellers near the end of the film. The others, fearing that the introduction of Bernard would lessen their popularity and celebrity, fail to mention that they had originally been travelling with a fourth.

Morons from Outer Space - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Morons_from_Outer_Space)