The former Beatle played a show at the Liverpool Echo Arena on Thursday (May 28)
The former Beatle was asked to play Ross Geller's British father-in-law
The former Beatle played the 'McCartney II' track at the O2 Arena on Saturday (May 23)
McCartney also played 'Temporary Secretary' from 'McCartney II' live for the first time
Pair have worked together on a number of recent tracks
Singer has enlisted Gaga for soundtrack to animated film 'High in the Clouds'
The pair recently collaborated on tracks 'All Day', 'Only One' and 'FourFiveSeconds'
Music stars help support the celebrity chef's latest campaign
Beatles icon explains how he came to write 'Only One' with rapper
Former Beatle will play in Philadelphia this June