'Number Four' aims for first place at box office

LOS ANGELES: "I Am Number Four," a teen sci-fi adventure starring young English hunk-of-the-moment Alex Pettyfer, is likely to open in the No. 1 spot at the North American box office this Presidents Day holiday weekend.Box-office observers say the film could do in the low-$20 million range for the four-day period.Directed by D.J. Caruso, "Number Four" tells the story of an alien teenager hiding