Thursday box office: Katy Perry: Part of Me 3D debuts with $3m while The Amazing Spider-Man now sits with $75m.

So The Amazing Spider-Man heads into the Fri-Sun weekend with $75 million after three days.  There is little to speculate at this point.  All relevant mathematical precedents (Transformers, Transformers 3, Spider-Man 2, War of the Worlds, etc.) point to The Amazing Spider-Man ending its six-day weekend with around $140 million.  I'll discuss whether that's good or bad come Sunday (it's a little complicated), but for now the film is no outright flop and probably will encourage other studios to consider rebooting their cherished properties sooner rather than later.  Alas... Anyway, the first day for Paramount's 3D musical documentary, Katy Perry: Part of Me, earned $3.1 million today.  That's obviously closer to the $4.9 million that Jonas Brothers: The 3D Concert Experience earned on its opening day (a Friday, natch) as opposed to the $12 million that Justin Bieber: Never Say Never earned over its debut Friday.  Even if the Katy Perry espionage thriller ends up closer to the $11 million that Glee 3D grossed versus the $72 million finishes of Michael Jackson: This Is It and Justin Bieber: Never Say Never, the film cost just $12 million to make and may-well become a popular slumber-party rental for the next year or so.  I make no promises about updating in regards to Friday numbers, but I'll have the full analysis for Peter, Katy, and Ollie (Stone) come Sunday.

Scott Mendelson