The Destiny's Child star revealed the news on The Queen Latifah Show, due to air in the US on Wednesday.
Kelly tells Latifah that Witherspoon asked her to marry him over Skype, while he was away in Bulgaria. Er, we guess a long-distance proposal is still kind of romantic?
And look! Kelly gave us a glimpse of the engagement ring when the happy couple went to watch Jay Z in Los Angeles earlier this month.
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