The English media personality, formerly in the band Hear'Say, will feature in an upcoming promotional campaign for Dubai, to be aired on Channel 4.
The campaign, called "In Dubai every day is an opportunity," was filmed in Dubai last week, and will be aired during Channel 4's coverage of the Dubai Dewhurst Stakes horse race on Saturday 16 October.
Developed by the London-based production company New Moon, it aims to encourage more British people to consider living in or visiting the emirate.
The campaign will tell the story of four characters - a taxi driver, a businessman, a groom and a "sophisticated woman", played by Klass - whose stories intersect around Dubai's Meydan racecourse.
Klass, who lives in Hertfordshire, said: "I was delighted to be able to support this campaign in Dubai. I first came to Dubai 15 years ago and a lot has changed since then. It really is an amazing place and whether you’re a family on holiday or someone working here, it has everything to offer."
The emirate, which has a strong tradition of horse racing, is sponsoring the Group One Dewhurst Stakes.
"The Dewhurst Stakes is traditionally the single most significant two-year-old race in Europe and is therefore a unique opportunity to showcase Dubai’s passion for horse racing," said John Ferguson, bloodstock advisor to Sheikh Mohammed bin Rashid Al Maktoum, Dubai's ruler.