Justin Timberlake secretly signs copies of his autobiography

Singer Justin Timberlake has been sneaking into book stores and secretly signing copies of his autobiography.

He took to Instagram and posted a third video of him sneaking into a store, this time here and signed a number of books, reports femalefirst.co.uk.

He captioned the video: "Strikes again. Come and get them, part III..."

The video followed previous similar posts shared by the "Filthy" singer, having visited a different branch of store Barnes & Noble two days after the book was released.

Among the revelations the 37-year-old singer made in his book was the fact he "almost got expelled" from school for smoking when he returned to Tennessee in 1994 after 'The All-New Mickey Mouse Club' was cancelled.

He recalled: "I came home a lot more sophisticated and aware than I had been before the show, but I tried to downplay it because I just wanted to seem like everyone else.