On Twitter, celebs mourn Amy Winehouse

Rihanna laid bare her respect for Amy Winehouse with multiple tweets tagged #DearAmy#.

Pop princess Demi Lovato, too, expressed her sadness after hearing the news.

Demi Moore reached out to Winehouse's family, offering her condolences.

Sin City actress Jessica Alba, too, expressed her sadness.

Ricky Martin became a bit emotional, proclaiming Winehouse finally free.

Nicki Minaj chose the path of denial.....

Songwriter Colbie Caillat called Amy Winehouse one of the greatest singers she had ever heard.

Singer Janelle Monae tweeted her thoughts about Winehouse, as well.

Burlesque dancer Dita Von Teese shared the memories she had with Amy Winehouse.

Actress Sophia Bush had some sound advice for those who were battling addiction.

DJ and singer Joel Madden dedicated a tweet and a blogpost to Amy Winehouse.

Kelly Osbourne's grief knew no bounds. Post this tweet, she even announced that she would be off Twitter for her while.

A twitter user who tried to call her out on not helping Winehouse come out of her addiction bore the brunt of her wrath as she advised him to shut up about things he knew nothing about.

It's a commonly known fact that it was because of Osbourne's intervention that Winehouse tried rehab to begin with.