Harry Styles was among the stars at Warner Music Group's big summer party last night (17.07.14).

The 20-year-old heartthrob took a break from One Direction's sell-out 'Where We Are' stadium world tour to sip cocktails at the lavish party, held in association with British GQ magazine, at Shoreditch House in trendy east London.

Harry and other A-list guests enjoyed music-themed cocktails including the Parlophone Punch, Atlantic Breeze and Warner Spritz.

Other stars who attended the lavish bash included former Girls Aloud star Nicola Roberts, who wore a striking halter-neck red dress, Conor Maynard, Rudimental and Amber Le Bon.

Harry was recently praised for his songwriting skills by US songbird Ariana Grande, for whom he penned a track called 'A Little Bit of Your Heart'.

She said: ''I was at the studio one day and he was there, and literally, [songwriters] Johan [Carlsson] and Savan [Kotecha] were like, 'Hey, do you want to write something for Ariana?' And he was like, 'Sure, mate.' And he just did.

''It's a beautiful song. He's an amazing writer. It's really beautiful. He's amazingly talented.''