Each culture and region has its own independent celebrity system, with a hierarchy of popular film, tv, and sports stars. Celebrities who are very popular might be unknown abroad, except with culturally-related groups, such as within a diaspora.
In some cases, a country-level celebrity might command some attention outside their native country, but not to the degree that they can be considered a global celebrity. For example, singer Lara Fabian is widely-known in the French-speaking world, but only had a couple of Billboard hits in the U.S., whereas singer Celine Dion is well-known in both communities.
A local celebrity can be more of a household name than a national celebrity and may often experience the same type of attention from the public as a national celebrity albeit in the confines of their particular region. 
Subnational entities or regions, or cultural communities (linguistic, ethnic, religious) also have their own 'celebrity systems', especially in linguistically or culturally-distinct regions such as Quebec (a French-speaking province in Canada) and Wales (a constituent country of the UK). 
Each culture and region has its own independent celebrity system, with a hierarchy of popular film, tv, and sports stars. Celebrities who are very popular might be unknown abroad, except with culturally-related groups, such as within a diaspora. 
The rise of international celebrities in acting and popular music is due in large part to the massive scope and scale of the media industries, enabling celebrities to be viewed more often and in more places. 
A small number of celebrities can be considered 'global', in that their fame has spread across the world, even across linguistic and cultural boundaries. 
