According to this report, celebrities generate higher levels of attention among viewers but that impression is not always strongly linked to the advertised brand.

“Testimonials by celebrities… are below average in their ability to change brand preference. Viewers guess that the celebrity has been bought, and they are right. Viewers have a way of remembering the celebrity but forgetting the product.” What's going on? problems always occur. Celebrities are the brand name that attract most people, and they played on them to cheat the others.