TS is celebrity, so it is a given that she has multiple stylists managing how she (and her hair) looks.
I think some people do have TS-style curls though. My longer hair looks a lot like hers and I didn't really didn't do anything to my hair when it was that length. In other words, I don't think her hair (heat styled or not) is a miracle. Shrug.
If you hair is more wavy it might help to scrunch/diffuse upside down and plop with a hard hold gel.