McCartney and Corden were all smiles when they posed for a selfie at the statue of the Fab Four.
While in Liverpool, he also made a stop at the Philharmonic Dining Rooms, where he played a set with members of his band. The Liverpool Echo reported that tickets were being offered yesterday to locals for a "secret gig" with a global superstar.
Additionally, there's another mystery for McCartney/Beatles fans: his profile photo Twitter is now showing just a white box and all his Instagram photos have disappeared, indicating that an announcement of some kind could be on the way.
He has been known to have been working on a new album for some time, but rumors have also been flying about a special Beatles release to celebrate the 50th anniversary of The Beatles, or the "White Album."