Just five minutes walk away, his parents Victoria and David Beckham were hosting a star-studded dinner at the designer's Mayfair store.
But like most teenagers, Brooklyn would rather spend a night out without his parents 'cramping his style' as he attended the premiere of a new short film on Tuesday.
The aspiring model, 16, joined a host of big names, including Sir David Attenborough, Henry Cavill, David Gandy and Nick Grimshaw at Dunhill London's Bourdon House...
...The event, on the last night of London Fashion Week, was to mark the premiere of a new film by the World Land Trust about the plight to save micro orchids, some of the smallest and rare planet species on Earth.
Brooklyn was there to support Creative Director Jonny Lu - who made the film - who has previously worked with his mother Victoria.
Sir David, who is patron of the World Land Trust, introduced the film to the select crowd at the private event, which was hosted by Dunhill's CEO Fabrizio Cardinali.
Also in attendance was model/actress Tallulah Harlech, designer Peter Pilotto and new mother Lily Cole.
Model Lily, who gave birth to her first child on September 11, looked radiant in a red maxi dress and tan coat as she chatted away to Sir David.
The six-minute long film Orchids of Baños, which will be screened on Dunhill.com, shows the world of the Trust and their Ecuador conservation partner Fundación EcoMinga.
The film follows Ecominga botanist Lou Jost's discovery of 10 new orchid species in the Andean cloud forests of central Ecuador.
The film itself is only 6 minutes long, but has been shot by art director Jonny Lu, who works with the likes of Victoria Beckham and Givenchy.
Guests at the party were given the chance to acquire naming rights to the 10 new discoveires, with funds going to fund conservation of the orchid habitat in Ecuador.
Sir David Attenborough enthused: 'The natural world today, in spite of all of the disasters and catastrophes that afflict it, is still full of great wonders. World Land Trust aims to find those wonders and help the local people own the land in which those wonders are found.'