Actors Hugh Grant, Rupert Everett and David Harewood were among the stars who took part in a reading marathon in Trafalgar Square on Saturday.
Hundreds of people gathered at the London landmark for the Get Reading Festival.
The event, which was organised by the London Evening Standard and e-reader brand Nook, aimed to encourage children to enjoy reading.
Everett said: "I think we're reading less and less and I think we have to find a way for us all to start reading more because otherwise we're going to become more and more virtual.
"There's something about the written word that is absolutely magical for the development of the human brain. If it is something that is literally phased out completely, we're going to become blobs, if we aren't already."
At the festival Everett read from Oscar Wilde's The Happy Prince, which he said was his favourite book as a child.
Hugh Grant recited a passage from CS Lewis' The Lion, The Witch And The Wardrobe, while Homeland actor David Harewood joked that he read "rather badly" from Roald Dahl's Charlie And The Chocolate Factory.
"I just love Roald Dahl because I think he was such an incredibly imaginative writer," Harewood said.
"I think it's really great that we have these classic books that are sitting there. If kids can be encouraged to get into them, I think they'll be surprised to find that a lot of them really do push the boundaries of humour.
"It can be quite dark as well, I think that is great for kids."