Arin and Katie look like any couple in love, but he was born a girl and she was born a boy. They've shared their transition online, inspiring a new transgender generation.

Arin Andrews and Katie Hill look like the perfect teenage American couple in love. They hang out together, see friends and go to the movies, but their love is one in a million - Arin was born a girl and Katie was born a boy. They are both transgender.

Arin began life as Emerald, a beauty pageant-winning little girl. The name on Katie's birth certificate was Luke, a boy obsessed with computer games. They met as they were transitioning genders and fell head over heels in love. They've shared their love story online - posting videos charting their relationship, the physical changes they experience and the emotional rollercoaster of what it is to be transgender, from the lows of bullying, abuse and suicide attempts to their joy as they undergo hormone treatments and surgery.

Arin and Katie's story has inspired millions who have watched their videos online - they have become the poster boy and poster girl of the young trans community. Devon, an 18-year-old who has gone from girl to boy, looks up to Arin and takes comfort from knowing there's someone online going through the same challenges as him. We follow Devon's own rocky road to love. He can attract the ladies, but has to deal with the thorny issue of how and when to tell a girl that, biologically, he is still female. Claire, a gorgeous trans woman, is finding it impossible to find a boyfriend despite her looks, and she wishes she could have a fairy-tale romance like Arin and Katie's.

Claire, Devon, Arin and Katie - part of a new generation who are young, trans and looking for love.