Jessica Alba Short Hair for a summer trip look?

my hair is lightish brown ,so i was thinking what could suit my hairtyle the most as i  had to go  for a weekend trip with my school friends and this time i wanted to surprise them.then my sister who was then watching a jessica alba movie told me that why dont i try the Jessica Alba Short Hairstyle.it will be possible as i have the same length of hair as she has .do i need to cut my hair further if i need to get Jessica Alba kind of hair or is my present length of hair enough?it would so exciting to get a new haircut!.