The Birmingham-based company printed and installed graphics for the event including the PVC stage and press backdrops and red sparkle vinyl floor graphics.

Bieber performed songs from his latest album at the event in front of a backdrop produced by the company.

Sales director Simon McKenzie said: "As always we really enjoy working with Westfield on such high profile events and again this demonstrates the diversity of our business and our commitment to providing a professional, quality service."

Hollywood Monster also produced a massive banner display, measuring 350m by 14m, for the opening of £1.45bn Westfield Stratford City in September, which was attended by around 200,000 people.  

The company, which has 65 staff, works with clients including Next, Virgin Media, Lilywhites, Debenhams and Redrow and Bovis Homes.