Actress Meghan Markel's bitter half sister writing a tell-all book as rumors swirl that Meghan and Prince Harry are engaged...
Meghan's half-sister Samantha Grant Tweeted about her plans and defended her decision to blow the whistle on Meg.
Last year Samantha told magazines Meghan was a social climber who had abandoned her father's side of the family once she went Hollywood [click here if you missed that].
