Happy birthday, from Justin Bieber. And the American Cancer Society.

I do my best to send greeting cards for the birthdays of friends and families, but these days, I admit that my best usually ends up being a quick email, maybe an e-card, and perhaps, a little rendition of "Happy Birthday" on their voice mail. (Hey! I am a trained singer!) But with the amazingly awesome personalized birthday video greetings on MoreBirthdays.com, I can have the likes of Rihanna, Weezer, Keith Urban--or yes, even Justin Bieber--do it for me. A slew of fantastic musical artists from country to rock to pop, have offered up their time to sing their own renditions of Happy Birthday which you can personalize with your own message and then send directly to your lucky recipient. Just choose the birthday boy or girl's fave (Jack Black's is pretty awesome), type in your message, and schedule the delivery date and time. Then just wait for the very surprised thank you email or phone call for making someone's day. [edited to add: This campaign is now over, but you can support the American Cancer Society's excellent work through their website, cancer.org.] The videos are free, but it's extra-cool if you add a donation to the American Cancer Society on the birthday boy or girl's behalf. We can't think of a better way to help someone celebrate their special day than by helping someone else reach their own next birthday. -Kristen We couldn't be more pleased to be working with our fantastic sponsor, the American Cancer Society, to help spread the word about their very cool MoreBirthdays.com website. To send a free personalized birthday greeting from a celebrity, visit MoreBirthdays.com.