How to Get Curls Like This?

http://www.latest-hairstyles.com/celebrities/megan-fox/megan-fox-wavy-hair.jpg

http://your-hairstyles.com/img/arts/2010/Feb/22/210/meganfoxglamwavyhair4_thumb.jpg

all i have is a straightener but can also curl and stuff, thanks!!
=]

Suggestion:

That looks more like beachy waves than curls.
Try this tutorial!

http://www.youtube.com/watch?v=mtQJsONY20Q