And by low-cut, we mean really low-cut. As in no end in sight!
Seen here leaving the Madonna concert in L.A. Thursday night, the Heroes actress got us thinking about her outfit. How does that even stay on? Is it skanky - and is that even a bad thing? And what's with the makeup and jewelry?
Tell us what you think of Hayden Panettiere's top below ...
What do you think of Hayden Panettiere's top?