Mariah Carey, Oprah Winfrey, SAG Candids

Kevin Mazur/WireImage

Happy birthday, Oprah Winfrey!

The media mogul turns 60 years old today and we just can't believe it.

The OWN head honcho, who gave her company's employees the day off today, is receiving tons of b-day shout outs from her A-list celebrity friends (not to mention the giant sequined portrait gift she received from Ellen DeGeneres!). From Mariah Carey and Alicia Keys to Kerry Washington, celebs are tweeting up a storm in celebration of Oprah's big 6-0.

Check out all the stars who have wished Winfrey a happy 60th birthday today.

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And last but not least.

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