While Dakota Fanning spent her weekend hitting the red carpet for the Rio International Film Festival, her little sister Elle Fanning hit the shops in Los Angeles in search of a Halloween costume.

While in South America Dakota looked sophisticated in her all white number as she posed for the cameras with her simple getup. The actress her blonde hair loose allowing it to spill around her shoulders. The "Very Good Girls" star looked simple yet stunning in her ensemble.

However, to the premiere of her new film "Night Moves, the actress turned to the dark side, arriving in a devilishly red Grecian gown, according to the Daily Mail.

This time around Fanning opted to pin her hair back into a sleek updo which highlighted her made up face that put an emphasis on her red pout.

[For photos of Dakota Fanning on the red carpet at the Rio International Film Festival click HERE]

Walking the red carpet solo without her 32-year-old model boyfriend the 19-year-old seemed to be in great spirits and even signed a few autographs for fans.

Meanwhile, back in Los Angeles her sister Elle Fanning took a trip with their mother to get started early on Halloween. The 15-year-old actress look quite pale during her day out in Toluca Lake, California.

The "Super 8" star wore a nude rose colored dress which may have not been the best decision when paired with her "ghostly" complexion and platinum blonde hair.

Check out photos from the young star's day out and let us know who is your favorite sister, Dakota Fanning or Elle Fanning? Leave us a comment of your thoughts below.