Determining who has the "best" jawline is subjective and depends on personal preference and cultural beauty standards. However, some female celebrities are frequently mentioned when discussing prominent and attractive jawlines.
While there's no definitive answer, the perception of an ideal female jawline often involves a defined angle, good facial structure, and overall harmony with other facial features.
One example from provided context mentions Angelina Jolie, who has been voted the most beautiful woman in the world twice and has a so-called obtuse angle jawline with a highly contoured mandible. This combination accents her facial structure and brings out her eyes. So, Angelina Jolie is often cited as having a desirable jawline.
Ultimately, the "best" jawline is in the eye of the beholder, but defined jawlines are generally considered attractive.