Mariah Carey is set to guest star on the reboot of 'The Proud Family', a role that comes 23 years after her first cameo on the original series. The reboot, titled 'The Proud Family: Louder and Prouder', is reportedly in its final season, which is expected to arrive on Disney+ in July. However, it is unclear if Mariah Carey's guest appearance will be part of this final season or if the final season has been officially confirmed.