Kayla is famous here to " Volantis... in certain circles. One of four women in the world who can perform a proper Meereenese Knot. ―Tyrion Lannister
Kayla is a recurring character in the third and fourth seasons. She is portrayed by contortionist Pixie Le Knot. Kayla is a prostitute in the King's Landing brothel owned by Petyr "Littlefinger" Baelish.
Kayla is a talented contortionist.
Kayla is a
prostitute and a highly skilled contortionist. She is one of only four women in the known world who can bend her body to the extent that she can properly perform a sexual position known as the " Meereenese Knot".
Marei and Genna, she is one of the three prostitutes in Littlefinger's brothel who are hired by Tyrion Lannister to service Podrick Payne as a reward for saving his life in the Battle of the Blackwater. Kayla and her colleagues are apparently so satisfied with Podrick that they decline payment, much to the astonishment of Tyrion,  Bronn, Ros, and even Varys.
Kayla is present as an entertainer at the
wedding feast between King Joffrey Baratheon and Lady Margaery Tyrell. Her performance is admired by Oberyn Martell and Ellaria Sand.
Season Three appearances
Dark Wings, Dark Words
Walk of Punishment And Now His Watch is Ended
Kissed by Fire
The Bear and the Maiden Fair
The Rains of Castamere
Season Four appearances
The Lion and the Rose Breaker of Chains
First of His Name
The Laws of Gods and Men
The Mountain and the Viper
The Watchers on the Wall
Behind the Scenes
Kayla, played by contortionist Pixie Le Knot
The actress who plays Kayla, Pixie Le Knot, is a professional contortionist.
In the books
novels, there is no character named Kayla. The " A Song of Ice and Fire Meereenese Knot" is an inside joke to the books fandom about a major plot issue George R. R. Martin had to deal with when writing A Dance With Dragons.