As one well-connected source put it, "They're like brothers who fight but feel bad about it and always end up coming together." Taylor, on the other hand, isn't even on his radar.
Kevin is the driving force behind Heart Beat, which benefits charities that work to improve the quality of life for children who have been diagnosed with cancer.
Taylor Swift is in a one-way feud with Kim Kardashian and Kanye West.
On the night of Katy's Raleigh, NC concert she was asked to help move a wall ... Christina says her right toe became gangrenous, and eventually needed to be amputated.
She says she wasn't able to use her foot for months.
As for Kanye, our sources say there are certain feuds he deeply cares about ...