The 61-year-old model was spotted enjoying dinner with the 63-year-old singer - who has been single since splitting from Meg Ryan last year - in New York City on Monday (14.09.15), fuelling speculation they are dating.
The casually-dressed pair - who had arrived separately - appeared happy and relaxed as they left the Bowery Hotel and got into the 'Jack & Diane' singer's chauffeured car.
An onlooker told 'Entertainment Tonight' John seemed affectionate towards Christie, touching her back as they walked.
Christie - who has been married four times and has three children, Alexa Ray, 29, Jack, 20, and Sailor, 17 - has previously admitted it is hard to find love with someone her own age.
She said: ''It seems like during this period that most of the guys are like 38, 39, 42, like that sort of age group.
''It's funny because I think that at that age they have nothing to prove. They're very confident and do just what they want to do. [With] men my age I feel quite invisible to them.
''I think a ten year span is fine.''
What's new in the music world this week?
'Sounds of Silence' was released on this day (January 17th) in 1966.
Listen to Alex Bayly performing 'Animal'.
Two weeks ahead of Independent Venue Week, Dry Cleaning made 'Britain's Best Small Venue 2015' (NME) the second port of call on their 2020 tour.
'Leave Home' was released on this day (January 10th) in 1977.
For their last gig of the year, The Libertines came back to their adopted hometown of Margate to finish off their latest tour.
Celebrating the birthday of David Bowie with his most legendary songs.