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The actress was just one of several stars celebrating via social network Twitter. Cher, who appeared in a campaign video wrote: "I'm so happy! This is one of the great nites (sic) of my life !!!! Tears r streaming down my face! women we have a champion!!!"
Lady Gaga first tweeted a series of random digits before adding: " I JUST GOT OFF STAGE IN COLUMBIA!! CONGRATULATIONS MR. PRESIDENT @BarackObama We are so proud to be American tonight! YES!!! YES! YES!!"
Katy Perry was also thrilled. The Firework singer, who on election day posted a picture of her and the president with her grandmother wrote: "The people have the power! Proud to stand by you for 4 more years."
Celebrities Celebrate Obama's win
Eva Longoria: "We did it!!! Obama re-elected!!!!! Yes!! Yes We Can! Me and my friends celebrating! I'm in tears! Moving the country forward!!! Obama!!!"
Sophia Bush: "Crying. Happy tears. Breathing deep. #4MoreYears #EqualityMatters #WomenMatter #EducationMatters Thank you Mr. President"
MC HAMMER: "America is making a huge statement !!! Humanity is primary.The people need access to medical care and we Appreciate and Respect Women !!!"
Olivia Wilde: "AMERICA! You have spoken! Women! You have been heard! Young people! You proved them wrong! Tireless Obama volunteers! I THANK YOU!"
Michael Moore: "We, the people, have spoken"
Ricky Martin: "We, the people, have spoken"
Brian Atwood: "Yay!!!! Woke myself up in Milan Italy to see results, couldn't be happier. Congrats Barack Obama our president"
Kerry Washington: "Wow! Wow! Wow! #Obama2012 YOU DID IT AMERICA! YOU DID IT!"
Rihanna: 'Put one in da air for the Prez!!!! Our dear Obama!'
Alec Baldwin: "Fox News is hurting the Republican Party....."
Dianna Agron: "Congratulations, Mr. President, our president"
Steve Martin: "To commemorate Obama’s victory I’m having a tea party"
Ricky Gervais: "Well done America. We knew you’d get it right"
Zoe Saldana: "Barack Obama!!! The 44th President of the United States of America. God bless America, once again!"
Nicole Richie: "We did it America!!!!"
Olivia Munn: "Four more years!!! Barack Obama is our 43th and 44th PRESIDENT!"
Cher : "I'm so happy! This is one of the great nights of my life!!!! Tears are streaming down my face! women we have a champion!!!"
Ricki Lake: "Breathe. Sigh. Relief."
Mark Ruffalo: "I am so proud to be an American!!! I love our country and everyone in it. Even those who do not share my beliefs."
Lady Gaga: "alot of emotions right now. congrats President Obama...Im Canadian. Im good. #FreeHealthcare :)"
Katy Perry: "The people have the power! Proud to stand by you for 4 more years."
All the news as Duchess Kate's due date draws close...