The singer says she didn't publicly endorse a candidate at the 2016 presidential elections because she was 'protecting her mental health'.
The presenter was accused of "bullying" the six-year-old royal.
The former Big Brother host is taking over from Maya Jama and Alice Levine.
The Jeremy Kyle Show was cancelled earlier this year following the death of participant Steve Dymond.
The music manager bought the US singer's entire back catalogue in a controversial deal earlier this year.
The three-part Channel 4 series about the late Big Brother star concluded earlier this week.