It's relatively rare these days to find a celebrity who hasn't lent their voice to a good cause, whether that's for personal passion projects or a spot of good publicity. However, there are some stars so entrenched in activism that their work in this area has become almost as famous as the career that made them a household name in the first place. Here, we round up some of the most famous celebrity activists alive today, who speak out on everything from women's rights to animal cruelty and matters of social justice. Read on:

Anoushey Ashraf
Animal rights activist/WWF Ambassador.

Mahira Khan
UNHCR Goodwill Ambassador for Pakistan.

Shehzad Roy
Education activist extraordinaire.

Sidra Iqbal
Women and youth rights activist.

Ushna Shah
WWF Goodwill Ambassador.

Ayesha Omar
The Citizens Foundation Goodwill Ambassador.

Sarwat Gilani
Motivational speaker, Ambassador Special Olympics Pakistan, Ambassador Indus Hospital.

Ahsan Khan
NCRC Goodwill Ambassador for Pakistan.