Speaking on The Queen Latifah Show, the singer showed off her diamond ring and revealed fiance Witherspoon initially proposed on Skype while she was in Bulgaria, reported Digital Spy.
"He put a ring on it. He asked me first on Skype. And I was like, 'We're so far away from each other'," she said.
The former Destiny's Child singer was seen sporting a diamond ring on her fourth finger in an Instagram video last month, sparking engagement rumours.
"I remember we were both just kinda like, honestly, just staring at each other. And he asked me, and it was just that simple to say yes. I was like, 'I got my best friend to ride through life with'. He really is my best friend."
"It's been a while. We've kept it very, very low - for years, to be completely honest.