Teenage girl standing behind twin sister, hands on shoulders, both dressed in suits and looking at camera

Teenage twin sisters listening to mp3 player together, both smiling and looking up

Teen girl holding up apple, smiling at camera, portrait

Boy looking over sister's shoulder at camera, both smiling, cropped view

Teenage twin sisters photographing selves with cell phone, one smiling at camera

Teenage girl photographing self and twin sister with cell phone, both making faces

Boy looking over shoulder at sister, both smiling

Brother and sister back to back, listening to earphones, smiling at camera

Preteen girl with pinwheel, portrait

Teen boy carrying younger sister on his back, both smiling at each other, low angle view

Young woman, portrait

Teenage girl helping boy read book

Young woman outdoors, looking over shoulder at camera

Teenage girl smiling through tall grass at camera

Teenage girl resting head on arms, smiling at camera

Young woman standing on log, smiling over shoulder at camera

Teenage girl standing in field, holding out cupped hands, smiling at camera

Teenage boy looking over sister's shoulder as she digs in sand at the beach

Teenage girl embracing toddler, both looking at camera, portrait

Teen girl looking over grandfather's shoulder, both smiling, focus on background

Teenage girl bending over, embracing toddler, both dressed in ski-suits

Teen girl with tousled hair smiling at camera, portrait

Teenage girl drinking from cup

Teen girl listening to headphones, smiling over shoulder at camera

Teenage girl looking over boy's shoulder at camera, both smiling