Pig's Breakfast.

Pig's Breakfast is an Australian children's television series that was broadcast in 1999. The story involves two aliens, Meeba and Grob, who have crashed at a television studio on Earth in a galactic school bus. A producer at the station finds them and puts them in a TV show, thinking that the aliens are actors in costumes. Her two children, Rodney and Lucy, are the only ones who know that they are actually aliens.