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 17 of the very best, in the second of our picture galleries.
See the first part here.
. Celeb selfies - part 2
We asked you for your best celeb selfies and you didn't disappoint - here's another 17 of the best. Photo: UGC
. Jason Manford
Claire Smith met the multitalented comedian, actor, singer and presenter at a donut stand at the Edinburgh Festival. Photo: UGC
. Lionel Ritchie
Kevin van der Westhuizen was snapped with the superstar singer at a concert. Photo: UGC
. Rev Richard Coles
The former Communards star was happy to pose for a picture with Roy Tapping. Photo: UGC
. Paul Weller
The Modfather approached Rania Jane after a gig at the SECC thinking she was somebody he knew. She took the opportunity to get a picture. Photo: UGC
. Lulu
Proctor Lynnette was snapped with the Shout singer during her tour of Scotland.· Photo: UGC
1. Gerard Butler
Margaret Shevlin took the opportunity to grab a snap with the Scottish star at Edinburgh Airport while waiting to pick up her aunt from the same USA flight. Photo: UGC
2. Simon Pegg
Kenneth Syme met actor Simon Pegg at the Empire Leicester Square, in London, for the premier of his film 'Paul'. Photo: UGC
3. George Ezra
Singer George Ezra was filming a music video in New York's Central Park when Lauren Conway bumped into him. Photo: UGC
4. Lewis Capaldi
Debbie Henderson and Susie Ritchie had a great night meeting the chart-topper in an Edinburgh pub in 2019. Photo: UGC