The singer-songwriter announced the news - where else - on Instagram, where he announced that he popped the question in the New Year.
Sheeran, 26, has been dating Seaborn for over a year and spoke about starting a family with her on Australian radio show The Kyle and Jackie O Show. Sheeran and Seaborn both attended Thomas Mills High School in Suffolk, where they first met.
Prior to leaving the US, Seaborn worked as an Advisory Consultant for Deloitte & Touche LLP in New York. No wedding date has been announced.
Via Instagram