Today is World Smile Day, and tons of your favorite celebs are using social media to spread smiles and raise awareness for great causes. Invisalign actually partnered with Operation Smile for a #4MillionSmiles campaign, and every post you tag the hashtag in on Twitter or Instagram raises $1 that will be donated toward
100 Things To Do Before High School actress Brady Reiter is a long time partner with the cause, and she shared her thoughts with us.
"You're never fully dressed without a smile," she tells TWIST. "Join me in sharing your smile selfie and #4millionSmiles sign and help @invisalign heal 400 children's smiles with @OperationSmile. More at 4millionsmiles.com."
Click through the gallery to see more stars who've shared their smile pics, and make sure to post yours today using the hashtag to help make a difference!