"Taylor is now a convert to The Inbetweeners. She doesn't get all the references made by Neil, Will, Jay and Simon but she still finds it really funny," a source told The Sun.
"Taylor has a really good sense of humour and she's been bonding with Harry over her new-found love of the show."
Harry - who helped Taylor to celebrate her 23rd birthday by showing her some tourist hotspots in the Lake District - posted a picture of himself dressed up as an elf on Instagram, with the caption: "Christmas jumpers are out!! Get in."