The singer had sold out six previously-announced shows at the arena before adding the new gigs in July.
Tickets for the extra shows go on sale next Friday, November 9 at 9am and are priced at £45.00 / £55.00 / £70.00.
The shows are Bublé's first concerts in the country since his 20-date arena and stadium tour in 2010.
Bublé releases a deluxe edition of his Christmas album on November 19.
Packaged in silver foil, the new edition includes Bublé's Christmas greeting and adds bonus tracks 'The Christmas Song', 'Winter Wonderland', 'Frosty The Snowman' (featuring The Puppini Sisters) and 'Silver Bells' (featuring Naturally 7).
The sold-out dates of Michael Bublé's O2 residency are as follows: June 30, July 1, July 3, July 4, July 5, July 7. The new shows take place on July 8, July 10, July 12 and July 13.
Watch the Michael Bublé O2 residency trailer below