Carmen Electra and Ashlee Simpson Keep the Top Knot Alive!

Tie your hair up into a bun like Hollywood's hottest stars.

When you're having a bad hair day, a top knot is an easy fix. Not only is it simple to do, it's incredibly chic! The trick is learning how big your bun should go.

For a glamourous look, mimic Carmen Electra at New York Fashion week. Start with a high ponytail. Then, divide the ponytail in half and create two braids. Secure the braids around in a bun with bobby pins and finish off with hairspray. 

For an every day look, take note of Ashlee Simpson. The singer braved New York's windy weather by keeping her hair in a medium bun. Leave a few wisps off your face for a relaxed feel. 

While Rooney Mara was alble to pull of a tight, small bun at the Berlin International Film Festival, this isn't a hairstyle for everyone. Without the actress' delicate features, it can look like you're playing a ballerina. 

See one of Hollywood's hottest hair trends