Calvin Harris is babysitting Taylor Swift's cats.

The 31-year-old DJ has volunteered to look after the fluffy felines named Meredith Grey and Olivia Benson while the blonde beauty embarks on her '1989 World Tour', so is set to be spending more time in New York as he cares for the kitties.

A source told HollywoodLife.com: ''Add cat baby sitter to Calvin's duties as boyfriend.

''He brought it up to Taylor that he would be happy to watch her cats while she is away, so she took him up on it. So you will probably see Calvin in New York a lot more without her.''

The couple - who are rumoured to have first got together at a BRIT Awards after party in London in February - have previously had relationships with other stars, but the 25-year-old singer is reportedly already completely smitten with the musician.

The source said: ''She is in love with him, she has had it cross her mind but she knows not to bring it up, she is enjoying how the relationship is going without getting into anything marriage related.''

However, it seems they are both on the same page as Calvin Harris - who previously dated 'I Will Never Let You Down' hitmaker Rita Ora - isn't keen on getting married.

They added: ''He is shocked that he has been this committed so far, but marriage is not something he wants anytime soon.''