Does Jessica Alba Adlib Her Lines?

Jessica Alba is Elle Magazine's December cover girl.  She's quoted as saying: 

“Good actors, never use the script unless it’s amazing writing. All the good actors I’ve worked with, they all say whatever they want to say.”

I'm an avid reader of Elle (which may tank my credibility with some readers, but so be it), and I intended to read the quote in context before commenting.  Levine and August, however, are already sounding off.   

Photo: Carter Smith