Re: No paparazzi showing up

@zwemmendemelk In addition to the remark of @JonaO703 and @CGrant56  You could try to create a social event. Best to go for the meet and greet. This is also an event you should have done in order to get to a 4 star celebrity. At this event your Sims will meet one or more paparazzi's. The specific paparazzi Sims you will encounter depends on the EP's you have. 

When you don't see any paparazzi there, I recommend you start afresh as @CGrant56 suggested.

Have fun playing. 😉