Jordyn Woods could find herself in some legal hot water if she spills too much Kardashian tea on Jada Pinkett Smith's show ... because we've learned she signed a contract with the famous fam promising to muzzle herself. Also, Selena Gomez is back in the studio, and the timing couldn't be more perfect -- 'cause, as of this week, Ariana Grande's more relevant ... on Instagram, anyway.