Fergie spent thousands on a custom painted car so it would match her dress in a music video.
The 39-year-old singer was shooting her 2006 single 'London Bridge' in the capital when she asked 'Ultimate Wheels' star Elo to provide her with a one of a kind Low Rider to match her outfit in the video.
Elo - who owns the London Motor Museum - was happy to offer the "Big Girls Don't Cry' singer a 1985 Cadillac Fleetwood called 'Eye Candy', painting the rare car a particular shade of sunset orange to please the star.
The car designer exclusively told Bang Showbiz: "For the Fergie build she wanted a low rider which would be very much British in style but at the same time it needed to be very audacious, very LA, very Vegas. It's got to have the striping, the overlaying, the airbrushing, the hydraulics and all of that stuff. It was for her video.
"The Duchess needed the car to match the dress that she was wearing. So we had to paint the car a sunset orange to match one of the dresses she wearing. We were given a sample of the colour of what her dress would be on the day and to paint the car to match."
Elo - who names footballers Samuel Eto'o, Ramires and Emanuel Adebayor amongst his host of celebrity sporting and showbiz clients - also counts Fergie's Black Eyed Peas bandmate will.i.am among his favourite customers.
He said: "I've built cars for footballers that play at Chelsea, Fulham, Arsenal, rappers, singers and also for videos and promos including for will.i.am."
When asked about the 'Scream and Shout' singer, Elo explained: "He's a very easy guy to work with, very polite. He'd come out of his way to talk to you."
'Ultimate Wheels' continues Thursdays at 9pm, on HISTORY.