The 28-year-old singer needs to be back in the UK in time for the premiere of her new film "What To Expect When You're Expecting" and so will only be able to attend the festival for two and half hours, reported Mirror online.
"It's hectic for Cheryl at the moment, launching her comeback single, Call My Name, which happens to coincide with the release of the film. But she planned to go to Cannes a while back, along with the other L'Oreal spokeswomen.
"Her visit is being timed with military precision. She is jetting in, attending a party and leaving in the time it takes most people to unpack. The cost is astronomical but it's important Cheryl's there," a source said.
Eva Longoria, Jane Fonda and Beyonce Knowles are also spokesmodels for the L'Oreal.
"Cole will fly in on a private jet, then dash to the event. She has a selection of outfits, worth around 10,000 pound all together, and a range of diamonds to wear," the source added.