AceShowbiz -

Rumor has just arrived on the web, suggesting Britney Spears is working on her second greatest hits compilation. According to GimmeBritney, the record is due for September release and will include songs from two of her latest albums, "Circus" and "Blackout", as well as 6 new tracks she is currently recording.

Earlier last month, Britney Spears was rumored to re-release "Circus". She reportedly gets helping hands from producer Fernando Garibay (Lady GaGa) and songwriters Olivia and Miriam Nervo (David Guetta).

While no statement is made by Britney's camp concerning the rumor of her new project, the "Womanizer" hitmaker tweeted about working in studio with Max Martin in Stockholm. Beside recording new songs, she will also return to Canada and North America for a number of concerts with Ciara and Kristinia DeBarge as supporting acts.

Britney will start the gigs at Copps Coliseum in Hamilton, Ontario on August 20 and finish it off at Mandalay Bay Events Center in Las Vegas, Nevada on September 27. In an interview with Entertainment Tonight, she said, "We have a song called 'Mannequin' that we're adding to the show, which I'm really, really excited about, so it should be interesting. We have to update [the show] or it gets really boring." More detailed info about her forthcoming shows can be seen on her official website.