The 41-year-old will no longer be working with Sloan and her colleague Nanci Ryder after six years, says The Hollywood Reporter.
Ryder refused to comment on why they are no longer representing Lopez, but said: "I think Jennifer is fantastic and I'm very sad that we're not going to be representing her anymore."
However, Lopez's manager Medina dismissed the star's decision as something trivial.
He commented: "Artists and PR companies parting ways happens all the time. This is as much news as me redoing my furniture."
