Taylor Swift Calvin Harris
Calvin Harris is proving his mettle as a boyfriend by stepping up to do the catsitting while Taylor Swift tours Getty

Scottish singer-DJ Calvin Harris is reportedly babysitting American singer-songwriter Taylor Swift's cats.

According to a report in Hollywood Life, the 31-year-old I Need Your Love singer will be taking care of the 25-year-old Shake It Off singer's cats, Meredith Grey and Olivia Benson, while she travels the world for her 1989 tour.

"Add cat babysitter to Calvin's duties as boyfriend," a source said. "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."

It was previously reported that Harris is allergic to Swift's cats and "their relationship is doomed".

Rumours that Rita Ora's former boyfriend and the Red singer were dating started in March, and the two were pictured shopping in Nashville, dressed similarly.

Later, the two were spotted at a Kenny Chesney concert, getting cosy in the audience.

"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," another source told the website.

It was previously revealed that Swift has been single since splitting up with One Direction singer Harry Styles, after the pair dated for a whirlwind two months in 2014.