The Rolling Stones have taken part in their first ever Twitter Q and A, answering questions on pre-gig nerves, alternative careers and Mick's bum.
Grrr! will be a 50-track celebration of the band's career, featuring a fancy 3D "augmented reality" cover.
The Rolling Stones are to celebrate their 50th anniversary with a new compilation spanning their entire career.
The band, who played their first show as The Rolling Stones back in 1962, will release 'Grrr!' on November 13.
The collection will come as a 50-track 3CD set, a deluxe edition of the same triple pack in a limited edition box featuring a book and postcards, a box set of five vinyl 12"s, or as a "super deluxe" box, with 4 CDS, 80 tracks, a 7" single, book and a poster.
And if that isn't enough, the artwork features a new "3D augmented reality" design. By downloading the free uView app, fans can take a look at the artwork and enjoy exclusive 3D animation leap forth from the sleeve art.