The former Destiny’s Child singer and boyfriend Tim Witherspoon have dated on and off for over four years.
Speculation about the engagement began last week after Kelly, 32, was seen with a diamond ring on her wedding finger in a pal’s Instagram video.
"She has been showing [the ring] off to friends and family and is very happy," a source told Us Weekly magazine. "But she wants to keep it between them to enjoy and celebrate for a bit longer."
This would be Kelly’s first marriage – she was previously engaged to American football player Roy Williams. The couple split two months before their wedding in January 2005.
"I was too young for marriage," Kelly later told Cosmopolitan UK. "But sometimes you fall down and you learn from it."
One person who probably won’t be invited to the wedding is Kelly’s estranged father, Christopher Lovett. The recovering alcoholic says he hasn’t seen his daughter for decades but he’s hoping she will allow him back into her life.
“So many previous years have passed and I'm getting old. I just pray she comes back into my life before it's too late,” he told Star magazine in October.
“I couldn't control it. I hoped I could make it up to her. But I'm still waiting for that day. Whenever [Destiny's Child] was on the cover of a magazine, I would call and beg them to tell her I was looking for her.”