The 32-year-old actor, who has been dating the 'Applause' hitmaker for almost three years, believes their relationship works because they bond over their similar interests.
Speaking to Glamour magazine, he said: ''I think we just complement each other. I'm proud of her, and I'd like to believe she's proud of me. We're kindred spirits.''
Despite juggling their hectic schedules, the couple take time aside regularly to enjoy each other's company.
Asked what they do together when they have time, Taylor explained: ''We'll hike together. I'm always giving her flak, like, 'Babe, you can't wear your heels when we're hiking.' We've been painting a bunch lately too ... There's a lot of laughing. I think that's the basis of a healthy relationship.''
Meanwhile, 'The Other Woman' star is rumoured to be planning to propose to the 28-year-old singer - whose real name is Stefani Germanotta - in the near future, but hasn't found the right engagement ring yet.
A source recently said: ''Taylor's been looking at engagement rings for Stef for a couple of months.
''He has told a couple of his close guy friends that he wants to propose soon.''
Her parents weren't too fond of the idea.
The flat at Hauptstrasse 155 was where Bowie and Iggy lived between 1976 and 1978 in the city, which inspired the so-called 'Berlin trilogy' albums.
Grint will star alongside Dougray Scott and Ed Westwick in a 10-part TV series for Sony's streaming platform Crackle.
The Brits teamed up at the Hollywood Rose Bowl to perform a cover of The Purple One's 'Nothing Compares 2 U'.
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