Louis Tomlinson flew Briana Jungwirth to London to watch One Direction.

The 23-year-old singer has fuelled rumours that he's back together with the American stylist who's pregnant with his child after she was spotted at the first night of the band's UK tour.

The pretty blonde joined Louis' 17-year-old sister Lottie and his mum Johoannah Deakin backstage at the gig and the 'Steal My Girl' crooner is reportedly taking ''great care'' of his heavily pregnant guest.

An insider shared: ''He is taking great care of her and has definitely developed feelings for her. He thought it would be a nice idea to fly her over for the gig so they could spend some proper time with each other.

They added: ''Louis and Briana have grown much closer since he found out she was pregnant.''

Louis split from his girlfriend of four years, Eleanor Calder, in March and Briana's pregnancy was revealed in July.

Meanwhile, the singer's mum has taken the pretty blonde under her wing and has insisted on helping in the preparations for the birth and being there for the young couple.

The source told The Sun newspaper: ''His mum is taking a hands-on role too and has been giving her loads of advice. She wants to be involved as much as possible with the birth.''