A number of celebs have been speaking out about the Trayvon Martin case - in particular, largely calling for justice to be served in the form of the arrest of alleged shooter George Zimmerman. Spike Lee first retweeted what he thought was Zimmerman's address, only to find out that it actually belonged to an elderly Florida couple who was forced to flee their home in fear of retribution.

Most recently, comedian and actress Roseanne Barr

also tweeted the address of Zimmerman's parents. Both Barr and Lee have since apologized for the tweets.

On last night's O'Reilly Factor, Laura Ingraham suggested there's a double-standard at play when it comes to liberal versus conservative apologies made after headline-making slights. "It's funny - when Rush Limbaugh apologizes for something, it's not meaningful. But when Spike Lee apologizes and two innocent people are terrified, an elderly couple, then everything's 'oh that's fine, all forgiven.'"

Lastly, Oprah Winfrey also weighed in on the case on last night's "Extra," as well, calling the shooting "a tragedy."

"It's a tragedy and it is a shame that we're sitting here 33 days later and there hasn't been an arrest or questioning of actually what happened. It's a tragedy, and it's a shame, and we all know it. Black people, white people, brown people, yellow people all over the world are saying the same thing ... and justice needs to be served."