Anuska is correct. Celebrity opportunities are considered Special Opportunities. Another that comes up under that same category is the Oh My Ghost opportunity. You'd need to be careful with this one and not use it on any of the mortal family because it counts as extending their lifespan, which is against the rules. And since even house members who aren't family still have to live and die a natural death, they wouldn't be able to have that opportunity either. So, in summary... don't use the Oh My Ghost special opportunity. You may, however, use the Celebrity special opportunities. Just keep close track of them because if one is a Black Op, no other Immortal may do the opportunity at all.