The 'Oops I Did It Again' singer announced the big news during her show at the Planet Hollywood Resort & Casino on Wednesday evening (9 September).
She told the audience: "I have some big news tonight. I am going to be in Vegas for two more years!" Woohoo! Maybe that means we'll be able to catch her 'Britney: Piece Of Me' show at some stage in the future!
The superstar began her Las Vegas residency in December 2013. Her show features a setlist of songs from her first ever single 'Baby One More Time' to hits like 'Womanizer', 'Toxic' and her will.i.am collaboration 'Scream and Shout'.
Her manager Larry Rudolph told Billboard earlier this year: "My thought was, if you bring Britney Spears to this town and create what is in essence a pre-game show for that audience -- where they go to the pool, take a nap, pre-game with Britney, then hit the nightclub -- that becomes the majority of the people who come to our show."
The extended residency will include a makeover of the current set.
Britney: Piece Of Me takes place inside the The Axis at Planet Hollywood, which is a 4,500-seater theatre. Tickets for the new shows will go on sale from 14 September.