Britney Spears Justin Bieber Hearts

Celebs like Britney Spears, Justin Bieber and Lady Gaga are proving that the power of Twitter can be used not just for fun trending topics but for good.

On Wednesday, Spears Tweeted the above pic of herself with the message, "Change your profile picture today & make sure to #showyourhearts." She is currently touring for Femme Fetale.

BieberTwitterShowHearts230.jpgThe reference is to a campaign for the Berry children -- three children who survived a car crash in Texas on July 3. The head-on crash killed their parents, Joshua and Robin. Brothers Peter, 9, and Aaron, 9 were paralyzed and are still in the hospital. Sister Willa, 6, suffered broken bones.

Now, celebs are getting behind the campaign for people to change their social media profile pictures to reflect the campaign, and to donate at or via text message (text BERRY to 85944 to donate $10.)

Since Tuesday, avid Twitter-er Bieber has Tweeted or re-Tweeted more than 50 messages about the cause.

Other celebs to Tweet about Berry kids include Ryan Seacrest, Diddy, Kim Kardashian, The Jonas Brothers, Nick Lachey, Katy Perry, Khloe Kardashian, Lady Gaga and more.

See a picture of the Berry kids after the jump.