It's time for another celebrity hairstyle round up. Lauren Conrad has changed things up with a fresh new bob, while Nicole Kidman looked like she was having a tough day at the office, thanks to her new film role. At the other end of the scale, Rihanna is wearing a luxury look just in time for New Year's. Maybe it's time for you to think about your New Year's resolutions around your hair care collections - time for a fresh look with some fresh products? Lauren Conrad has been fairly loyal to her low maintenance blonde style over the years. Finally, it seems like the birth of her son has prompted her to change up her style. After testing out a lob earlier in the year, it looks like her stylist has taken a few more inches off. Lauren's wearing a choppy new bob and it looks great. The simplicity means a straightforward hair care collection is all it will take to maintain as a busy new mum. Nicole Kidman will probably need a touch of luxury pampering after wrapping her shoot for her new movie, Destroyer. She plays an LAPD detective in the film, and it looks like life has not been kind to her character. It's quite a shock to see Nicole slouching around with an unkempt dull brunette bob, complete with rough-cut bangs. The straight leg jeans, T shirt and leather jacket really added to the uncharacteristic look. We're glad she can wash it all off at the end of the day. Rihanna is usually at the front of the pack when it comes to luxury style and her new look is no exception. Announcing her new look on Instagram, the star showed off her ‚Äòcinnamon chocolate' look (also known as ‚Äòroot beer' hair). She'll be in need of a new hair care collection to maintain this lovely warm colour. This warm brown look with plenty of blonde tones looks cosy and sassy at the same time.