The couple also posted a a picture of John Luke holding up a sign that read "Future Mrs. Robertson," with an arrow pointing to McEacharn, while she was proudly showing off her engagement ring."Happy Birthday to the boy I'm going to marry," McEacharn wrote on Instagram.
Happy Birthday to the boy I'm going to marry❤️❤️
"I am so excited to marry my best friend," John Luke tells US Weekly. "I know my parents married young as well, and they have always been examples of what 'could be' to me. Fast-forward 22 years and they are more in love than ever, and I hope Mary Kate and I are the same way in the years to come. God has truly blessed us."