The 24-year-old singer has been dating the scrapper since the end of last year and said she loves his sport, reported E! online.
"It's cage fighting... It is dangerous," she said during a taped appearance on "The Ellen DeGeneres Show".
"Of course (I worry about him)."
But she has no sympathy for the opponents he destroys in the cage, adding, "I don't feel bad. It's a sport.
Disclaimer: No Business Standard Journalist was involved in creation of this content