The couple announced their engagement on Thursday with Duff sharing two images of the sparkler on her Instagram. She captioned the image: "He asked me to be his wife."
Koma then posted the same photographs with the sweet message: "I asked my best friend to marry me... "
The news of their engagement comes nearly seven months after the birth of their first child, a girl they named Banks Violet Blair.
Duff has a six-year-old son, Luca, with her ex-husband Mike Comrie.
The actress has been open about her challenges while pregnant and in post-pregnancy.
She had recently shared a photograph of herself breastfeeding her daughter and said how difficult it's been pumping while at work.
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