What makes a celebrity endorsement a touchdown

On Sunday, Sarah Michelle Gellar will try to sell you Olay face cream. Adam Scott and 2 Chainz will pitch you Expensify to do your work expenses. And Christina Applegate is going to threaten some too-chatty anthropomorphic M&Ms from the front seat of her mom van in hopes that somehow makes you want to eat a chocolate bar filled with the colorful candies.

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