Happy Birthday Harry Styles! One Direction Star Turns 19 and Celebrates with Caroline Flack [PHOTOS]

The youngest member of British boy-band One Direction (1D), Harry Styles, turned 19 and celebrated his birthday, with close friends, in London. According to a report in The Sun, Styles was joined by James Corden, Nick Grimshaw and former girlfriend Caroline Flack, at the Groucho Club.

The 33-year-old television host looked elegant in a black lace dress, monochrome block heels and combined the outfit with a chocolate brown faux fur coat. Styles and Flack shared a controversial relationship for three months; the two are 15 years apart in age. The two broke-up last year but Styles, in a Twitter post, said the split was a "mutual decision".

Harry Styles has often been linked with older women, including 32-year-old radio presenter Lucy Horobin and 28-year-old Alexa Chung.

Meanwhile, the report further claimed Styles and his friends visited two bars in Soho, where they partied until 4am, before returning to his north London pad. However, his One Direction band mates - Louis Tomlinson, Zayn Malik, Liam Payne and Niall Horan were nowhere to be seen.

Styles also tweeted on celebrating his last birthday as a teenager writing: "I feel olllllllllllldddddddddddd."

One Direction recently won Best International Group of the Year at the NRJ Music Awards, beating the likes of Coldplay, Maroon 5, Owl City and Carly Rae Jepsen. And as the boys took to the stage to accept the award, it was Styles who delivered the group's acceptance speech.

"I have to say massive thank you to our French fans. We wouldn't be here without you. Our French record label [is] absolutely amazing. We don't speak French," Styles said, adding, "Obviously, we weren't born here. To be welcomed in this country is amazing, so thank you so much."

Take a look at Harry Styles through the years...