Beyonce's album is ''almost done''.

Producer Pharrell Williams has been working with the 'Bow Down' hitmaker on her fifth album - which has been rumoured for release throughout 2013 - and says she is nearing completion.

He said: ''B's album is crazy. Let me tell you what it is. She's very particular. She's a Virgo. And she's not going to put it out until it's ready and feels like it's right to her. She's got a very specific taste. I guess that's the reason she's Beyonce.

''Her name is recognisable around the globe and that's huge. That comes from someone that has very particular taste. When you know what you want, you won't stop until you get it. [Other people are hearing her album] and are like 'Whoa!' And she's like, 'Yeah, I'm almost done.' And she's the queen.''

So far new tracks released by Beyonce in 2013 include 'Standing on the Sun' and 'Grown Woman' which were used in adverts, and she previewed another composition, 'Bow Down / I Been On' on her blog, but the album is yet to get a title or release date.

The star is also said to be filming a video for every track on the record, and was recently spotted recording at a bomb shelter in Newbury, near London.

The singer reportedly had the bunker swept for radiation before she would enter to ensure it was completely safe.

A source said: ''Beyonce is shooting a music video for every track on her new album.

''The record has been delayed, so she wants to make a big splash when it eventually comes out. She wants to be in the UK with baby daughter Blue Ivy as Jay Z tours, so this was a good chance to shoot a video in the UK. It's an amazing location for a music video.''