The Twittersphere has been having its own version of a coming out party for NBA star Jason Collins.

Jason made worldwide headlines yesterday when he became the first active American athlete from a major sports team to reveal he's gay. He declared in an upcoming issue of Sports Illustrated: “I’m a 34-year-old NBA center. I’m black. And I’m gay.”

Although the response has been overwhelmingly positive so far, there have been some negative backlash as well. ESPN reporter Chris Broussard referred to Jason's homosexuality as "an open rebellion to God," while Miami Dolphins player Mike Wallace posted (and quickly deleted) a tweet which said, “All these beautiful women in the world and guys wanna mess with other guys SMH.”

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Fortunately, numerous celebrities have showed their support via Twitter including Ellen DeGeneres, Katy Perry and Howard Stern. Find out what they had to say below!

Bill Clinton: I'm proud to call Jason Collins a friend.

Katy Perry: Congrats, Jason Collins, and thank you!

Ellen DeGeneres: I’m overwhelmed by your bravery, Jason, & sending so much love.

Rosie O’Donnell: Thank you Jason Collins - for being the first one - knocking down doors!!!

Howard Stern: Big support to @jasoncollins34. That’s not an easy thing you did.

Judd Apatow: "I'm a 34-year-old NBA center. I'm black. And I'm gay," - Jason Collins ” an inspiring, courageous piece.

Dwayne “The Rock” Johnson: Being real & authentic is very powerful. Well done Jason Collins for having the courage to take a monumental step forward. #LiveReal

Russell Simmons: proud of Washington Wizards' player Jason Collins (@JasonCollins34) for coming out. we will stand with you as you continue on your journey.

Eva Longoria: So proud of Jason Collins for being an example of bravery and courage. I applaud you!!!

Kathy Griffin: Hey @JasonCollins34 Inspired by your courage and leadership.

Kobe Bryant: Proud of @jasoncollins34. Don't suffocate who u r because of the ignorance of others #courage #support #mambaarmystandup #BYOU

Lance Bass: Congrats @jasoncollins34 !! Giant leap for sports - and the conversation continues!

Dane Cook: A heartfelt congrats to all of major league sports first openly gay athlete, Jason Collins, for "coming out of the locker room."

Marlee Matlin: BRAVO to #jasoncollins for his bravery and class. Equality and changing attitudes are just inevitable.

Do you think we'll see any more athletes come out this year?

Photos courtesy of Getty Images and Boston Celtics