Ever Wanted Justin Bieber or Rihanna to Sing You “Happy Birthday”?

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The American Cancer Society wants to celebrate every birthday that someone reaches — and what better way than to have celebrities and musicians emphasize how special those days are? With the More Birthdays campaign, you can send personalized birthday messages to your friends, whether they're cancer survivors or not.

Each message is sung, which means that as cool as it is to have Justin Bieber, Rihanna, or Lady Antebellum in your e-mail or on your phone (you can choose to send a voice message), there's something really sweet about Craig Robinson from The Office or Scott Caan warbling birthday wishes.

You can watch the videos on the ACS site, or a few are embedded on YouTube. For the record, my favorite in terms of surprising production values is the Bieber/Usher cover [Mysto & Pizzi vs. Agent Jackson remix]:

I lied — for sweetness, Rihanna takes the cake: