Back at the turn of the millennium, they were just a bunch of kids — some with a bit of professional acting experience, most completely raw — that were fortunate and talented enough to be cast in "Harry Potter and the Sorcerer's Stone." The film conjured up almost $1 billion at the worldwide box office, and as "Potter" movie after "Potter" movie went into production over the years, Daniel Radcliffe, Emma Watson and the rest of the core cast essentially grew up together.
Almost a decade after their first witch-and-wizard adventure, the child actors have morphed into young adults — and the story lines have matured along with them. "Harry Potter and the Half-Blood Prince" (in theaters July 15), the sixth film in the franchise, presents all manner of love triangles, broken hearts and blossoming relationships. The difficult trick for the cast, though, was jumping lips-first into these romantic scenes with co-stars who had become like family.