Katy Perry will collaborate with Taylor Swift if 'she says sorry'

Katy Perry and Taylor Swift's feud has been going on for quite some time now.

American singer/songwriter Katy Perry has taken her feud with American singer/songwriter Taylor Swift to the next level. The 31-year-old singer said she will collaborate with the Bad Blood hitmaker if she apologises.

While answering questions during a Twitter Q&A session, Perry's fan asked: "will you collab with Taylor swift?"

Perry replied: "if she says sorry, sure!"

The Red singer and Perry were best friends for a long time before things got bad between the two. In an interview with Rolling Stone magazine, Swift revealed that the song Bad Blood from 1989, is about a former friend. The two apparently fought over backup dancers.

Perry took a dig at Swift during the 2015 Super Bowl half-time show, which took place on 1 February at the University of Phoenix Stadium in Arizona. During the performance, the Rise singer's backup dancers wore high-waist polka dot bikinis, something similar to what Swift had worn while holidaying with Conor Kennedy on the shores of Hyannis Port, Massachusetts in 2012.