PHOENIX (AP) _ Missy Elliott will be a surprise guest during Katy Perry’s Super Bowl halftime show. That’s what a source tells the Associated Press. The person, who’s familiar with the plans, asked not to be named because Elliot’s role hasn’t been announced yet by the N-F-L. Elliott was featured on a remix of Perry’s song “Last Friday Night (T.G.I.F.)” in 2011. At a news conference yesterday, Perry said the show would include an “old school” female singer.