The trio of Beyonce, Kelly Rowland and Michelle Williams, will appear in ads for McDonald's, as well as lend support to fundraising initiatives for Ronald McDonald House charities.
The deal will also see McDonald's sponsor next the group's global tour next year, which will now be known as "Destiny Fulfilled and lovin' it".
Larry Light, chief marketing officer of McDonald's, said: "Our worldwide 'I'm lovin' it' campaign gets another shot of high-energy excitement with this blockbuster partnership. Music is a universal language that touches the lives of everyone. And it will continue to power our brand as we connect to our customers around the world in fresh, relevant ways."
Beyonce hit the headlines last year when she said in an interview that sometimes her meals comprise of a few slices of tomato and cucumber because she battles to maintain a slim figure. Her comments drew criticism that she was setting a bad example to girls at risk of developing anorexia.
She has said in the past: "I am a natural fat person, just dying to get out. I go through agonies to keep my stomach as flat as possible, though it is never flat enough for me."
The star has appeared in advertising before, for Pepsi. McDonald's restaurants sell Coca-Cola. She is also the face of a new advertising campaign for the Tommy Hilfiger fragrance True Star.
At the press conference, Beyonce couldn't wait to use the McDonald's slogan. "We're lovin' the chance to work with McDonald's and know that together we'll create lots of fun and cool surprises. McDonald's shares our passion for music, so we can't wait to start connecting to our fans -- McDonald's customers -- all over the world," she said.
Justin Timberlake helped launch the "I'm lovin' it" campaign for McDonald's in 2003, but had restricted his appearance in the burger chain's advertising, to a brief clip and singing the endline. But Destiny's Child were less reticent to lend their power to the brand, happily appearing alongside Ronald McDonald at a press conference to announce the deal.
In the UK, government body the Food Standards Agency has called for an end to celebrity promotion of junk food by 2006, as part of measures to deal with the problem of obesity, particularly among children.
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