Lizzie Olsen, Olivia Munn & Sophia Bush Hair

As the festive season descends, the weather is changing and so are these starlets' hairstyles. Some are opting for darker hair colour, which is a classic end-of-year trend, but others are bucking the norm and colouring their hair lighter. And some of our favourite girls are going for longer lengths. Click through to see these stars' newest looks.