Taylor Swift and Calvin Harris are ''very low-key''.

The rumoured couple have reportedly been enjoying spending time together away from the spotlight ahead of the 'Blank Space' hitmaker's world tour, which kicks off in Japan in a few days.

A source told PEOPLE magazine: ''Before Taylor started her tour, she and Calvin spent as much time as possible together.

''They seem to be on the same page. They are very low-key and stay at home a lot. They mostly hang out with friends. They cook at home, or order in. They seem to have a great time together.''

Meanwhile, the 31-year-old DJ is reportedly keen on being a ''tour groupie'' for the 25-year-old star.

A source said: ''Calvin is bending over backwards for her. He's fitting himself into her life completely and he's even promised to visit her as much as he can when she goes on the tour. They're making jokes about how he's going to be her tour groupie.

''But they will still have a lot of long distance to deal with and that part sucks, she knows that won't be easy. That's the only drama she's got with Calvin though; otherwise it's pretty much perfect.''