6 Months Ago, TheImproper.com says (in Rob Pattinson, Twilight Clean Up at MTV Awards (See the New Trailer!)) Washington Post
 NY
Less publicized, but no less anticipated, Harry Potter stars Daniel Radcliffe, Emma Watson and Rupert Grint, were there, but by video only, to also introduce an exclusive clip from the upcoming summer blockbuster, “Harry Potter and the Half-Blood ...

And Examiner.com says (in Not just New Moon clip to show at MTV Movie Awards) In keeping with the previous “Twilight” announcement, it has also been confirmed that the clip will be introduced during the show by “Potter” stars Daniel Radcliffe, Emma Watson, and Rupert Grint." In addition to the Harry Potter clip, according to ...