And we know this because Jenna has just revealed that she uses one particular mascara to get them that way.
That mascara is (drum roll please) Charlotte Tilbury Full Fat Lashes in Glossy Black, $48, and Jenna swears by it.
So what's so special about this mascara in particular? Firstly, its brush it has five individual grooves carved into it meaning that it deposits the optimal amount of mascara along the lash line and (more importantly if you ask me!) pushes your lashes up and out.
The brush also has unusually fine-tipped bristles which means it can catch every lash, no matter how short or fine, coating them from root to tip in the super glossy black formula. It doesn't smudge or clump and no matter how clumsy you are when applying (hello - me!) it somehow creates a three-dimensional fluttering effect. And it is PRETTY!
Oh and one last thing ... When Jenna uses this multi-tasking mascara, she always coats her bottom lashes, too.
Try it ASAP and get ready for the long, lush lashes of your dreams.