Alyssa Milano Tweet: "Sweet Boy" Corey Haim

As celebrity and former child star Corey Haim passed away this week, many of his fellow stars paid tribute on Twitter. Below is a collection of some of those reaction, including the touching tweet from Alyssa Milano:

Alyssa Milano Tweet: "Sweet Boy" Corey Haim
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Among the stars who are grieving his loss is actress Alyssa Milano, who dated the actor from 1987 to 1990 "Just woke up to the sad, sad news that Corey Haim passed away," she tweeted. "RIP sweet boy." Haim, who had battled an addiction to prescription drugs for years, died Wednesday morning of an apparent drug overdose, according to Los Angeles police. Fellow '80s teen idol Ralph Macchio also expressed his condolences, writing, "Always so sad and disturbing when the addiction and demons prevail. RIP Corey Haim..."

Alyssa Milano Tweet: "Sweet Boy" Corey Haim