Rachel also addressed allegations by fans on social media that the 20-year-old has undergone a dramatic transformation in recent years and appears to have undergone cosmetic procedures.
'Jack has never had even one cosmetic surgery procedure.. he has gone from a little boy to a man.. his looks changed because he grew up! [sic]'.
At age 14, Jack admitted to paying for dental veneers in the midst of the AGT finals.
'I've been wanting to get my teeth fixed for ages and am really happy with them,' he told The Sunday Telegraph.
Today, Jack changed his Instagram tag line from 'emotionally unstable washed up popstar' to 'Sydney based emotionally unstable icon'.