The 64-year-old actor stars alongside the 'I Knew You Were Trouble' hitmaker in new science fiction blockbuster 'The Giver', and he took the opportunity to ''jam'' with someone he has a lot of admiration for as an artist.
Speaking on 'The Tonight Show Starring Jimmy Fallon', he said: ''I can't get enough of Taylor Swift, she is unbelievable and talented ... Most of our scenes are on the piano.
''Between setups we broke out the gits [guitars]... We just jammed, it was wonderful.''
Recently, Jeff admitted he was unsure whether to take it easy because of his advancing years, or take advantage of the time he has left by taking on as many projects as possible.
He previously explained: ''I've got two conversations going on in my head. One says, 'Hey, you've got a lot of stuff you want to do, man. Now's the time, because you're gonna kick the bucket pretty soon.'
''The other says, 'Oh, Jeff, you want to make the rest of your life a giant homework assignment? Just relax, man. Just relax.' ''
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