Kate Upton showed up to the London premiere of her new comedy, The Other Woman, in which she stars alongside Cameron Diaz and Leslie Mann, looking as stunning and glam as always. However, what we loved most about the look was her sexy, voluminous, swept-up bun.

Actually, we're not totally sure it even is a bun we're talking about here. We're pretty sure Kate's hair stylist teased the front part of her bangs reallyyyy high up, creating some sexy volume and definition, bringing her updo to new heights -- literally figuratively. Even if it's not a real bun, the retro glam effect is sexy and fun, and probably not that hard to recreate. All you need is a good hairspray.

We've said it before and we'll say it again -- we love the top knot, but it's best to have options. Click through the gallery to see more hair looks we've loved.