Harry Styles celebrated his 19th birthday at London's Groucho Club last night (31.01.13).

The One Direction hunk spent the evening at the exclusive venue with his close friends - including presenter and model Zara Martin and Hollywood actor Jason Statham - and was dressed dapper in a low-cut white t-shirt to show off his tattoos, paired with black skinny jeans and a navy blazer.

Among the showbiz guests was Harry's former flame Caroline Flack, who he enjoyed a brief fling with at the end of 2011.

The 'Xtra Factor' host dressed her best in a brown faux fur coat and a lace mini dress but seemed to be having problems with her hair before leaving earlier that night.

Before heading out, Caroline - who is 15 years older than Harry - wrote on her Twitter: ''Just had a massive argument with my fringe (sic)''

Harry was joined by his pals James Corden and Nick Grimshaw for dinner at La Bodega Negra restaurant before heading to Groucho, where he then moved on from to Base club to end his birthday celebrations.

Although he was joined by big names, his bandmates Louis Tomlinson, Zayn Malik, Liam Payne and Niall Horan were absent from the night's antics.

The heartthrob lay low as he left Base at 3.20am and took to his Twitter this morning (01.02.13) to share how he feels about it being his last year as a teenager.

He wrote: ''I feel olllllllllllldddddddddddd (sic)''