Happy World Book Day! Most amazing literary costumes from Lemony Snicket to the Mad Hatter

These are some of the most inventive costume efforts - including Begbie from Trainspotting.

It's World Book Day and children around the world are dressing up as their favourite characters to celebrate literature and reading.

This is the 20th year of World Book Day, which is marked in more than 100 countries to encourage children to appreciate books and reading.

More than 15 million £1 World Book Day tokens will be handed out to children in the UK and Ireland.

These can be exchanged for one of 10 new and free books, or it can be used to get £1 off any book or audio book costing more than £2.99 from participating bookshops.

From Harry Potter to the Mad Hatter to the Narnia wardrobe, here are the best costumes so far.

Owen and Kai ready for world book day @WfieldPrimary @Wfieldyr5 @Wfieldyr3 pic.twitter.com/WegAySon5i
— Alex (@allipotts) 2 March 2017

World Book Day @thebodycoach ðŸ˜‚ pic.twitter.com/nmqdy0s0zr
— GillDinCBT (@cbt_din) March 2, 2017

In honour of World Book Day, behold the best book-related costume: a child dressed as Professor Slughorn transfigured into an armchair. pic.twitter.com/baSTBNoxWy
— Alice Slater (@smokintofu) March 2, 2017

Celebrating world book day and Dr Seuss' birthday with our very own thing 1 and thing 2 #WorldBookDay #DrSeuss pic.twitter.com/B9K7bFWByp
— Andrea Edwards (@Andrea_Claire) March 2, 2017

World book day - Joe is after the Baudelaire fortune #WorldBookDay #countolaf @lemonysnicket pic.twitter.com/pemC5EwO0J
— Jenny McCabe (@jennymccabe) March 2, 2017

Celebrating our â¤ï¸ of books today for World Book Day. We have some amazing costumes and characters from some wonderful books. pic.twitter.com/M8AGCj6bMc
— St Mary's Rc (@StMarysHorwich) March 2, 2017

@StAndrewsCoE Pippi longstocking,Denise the menace and captain underpants all ready for world ðŸŒŽ ðŸ“š book day. pic.twitter.com/s2hh9XzdnS
— DEBBIE IRWIN (@DEBBIEIRWIN14) March 2, 2017

@OC my nephew as Harry pottery going to school today world book day pic.twitter.com/NUmo8mhIXj
— Sara Downey (@sarakillers) March 2, 2017

Oriel: Mad about books, hats & Mr. Depp #WorldBookDay #AliceInWonderland #LewisCarroll #MadHatter #bonkers pic.twitter.com/KK5lqBudW2
— Jason Chapman (@jasonchapmanart) March 2, 2017

Boys looking top notch in outfit and their favourite book #WorldBookDay pic.twitter.com/zEG6PsEWCi
— Humps â˜ (@dazehump) March 2, 2017

Is there room on the broom for a witch like me? #WorldBookDay @WorldBookDayUK #phswbd17 pic.twitter.com/Sa4nZ8W5q6
— Jennifer Van-Baaren (@JVanBaaren) March 2, 2017

So many choices for #WorldBookDay in this book. Thanks for the inspiration @KateisDrawing Peyton has loved learning about #greatwomen pic.twitter.com/ejUYuJEQ5F
— Holly Buckley (@HWBuckley) March 2, 2017

nothing will ever beat this notorious world book day costume #mrstrunchball pic.twitter.com/J1kRuONGPa
— georgia (@ge0rgiaaa_) March 2, 2017

#WorldBookDay
He has to go to school dressed as a character from Scottish literature.
So he's Begbie. pic.twitter.com/IWL0lb4C67
— joe heenan (@joeheenan) March 2, 2017