brand ambassador
US /brænd æmˈbæs.ə.dər/
UK /brænd æmˈbæs.ə.dər/

1.
brand ambassador, ambasciatore del marchio
a person, often a celebrity, who is paid to promote a company's products or services
:
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The famous athlete was chosen as the new brand ambassador for the sports drink.
Il famoso atleta è stato scelto come nuovo brand ambassador per la bevanda sportiva.
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Influencers often serve as brand ambassadors on social media.
Gli influencer spesso fungono da brand ambassador sui social media.