Look who’s doing Carpool karaoke Katy Perry will be doing Carpool Karaoke with James Corden on CBS. HERE is the full story. Katy Perry SHARE RELATED CONTENT Demi Lovato’s alleged drug dealer speaks on the overdose. Drake visits 11-year-old awaiting heart surgery. Emergency landing for Post malone! How much $ does Britney Spears have to give K-fed monthly? So, we think we know what Demi Lovato overdosed on. Ellen invites Demi Lovato to appear on her show post rehab.