Now everybody has a smartphone in their pocket, there's an easy way to document that chance meeting with your favourite actor or singer.
We asked readers on our Facebook page for their starriest shots and were inundated with famous faces.
Here are another 18 of the very best, in the third of our picture galleries.
See the first part here.
See the second part here.

5. Lewis Capaldi
The Scottish singer was happy to share the frame with Craig Lennox. Photo: UGC

6. Arnold Schwarzenegger
Darren Pearson said meeting the Terminator at the EICC was one of the best nights of his life. Photo: UGC

7. Mike Tyson
Nicola Notman boxed clever to get her picture taken with Iron Mike in Las Vegas. Photo: UGC

8. Adam Garcia
Emma Brocklehurst and her mum met the multi-talented actor, singer and dancer after a dance workshop. Photo: UGC

