Harry Styles enforced a strict Twitter ban at his 21st Birthday Bash

Guests were forbidden from using the micro-blogging website in a bid to keep details of the exclusive bash a secret.

Harry Styles' birthday party guests were banned from Twitter.

A-listers inside the One Direction star's extravagant 21st birthday celebrations at Lulu's Café in Los Angeles on Saturday were forbidden from using the micro-blogging website in a bid to keep details of the exclusive bash a secret.