James Devaney/Getty ImagesChris Lane is now officially off the market, after asking girlfriend Lauren Bushnell to marry him on Sunday.

The “I Don’t Know About You” hitmaker got her dad’s permission to pop the question on Father’s Day, and did it in the backyard of her family’s Oregon home.

“I knew she wouldn’t want some elaborate crazy proposal,” Chris tells People. “So, I decided to keep it pretty casual.”

“I asked her parents for different places in Portland I could potentially take her to,” he continues, “but after a lot of thought I decided doing it at the family cookout would be the most laid-back setting and that she’d appreciate the simplicity of me proposing to her in her parents’ backyard.”

Chris wrote the song “Big, Big Plans” for Lauren and used it as part of the romantic moment, even capturing the whole thing on video. You can check it out for yourself on YouTube.

“I lost it,” The Bachelor alum admits. “It was the happiest moment of my life!”

Chris says he expects Lauren will do most of the wedding planning, though he’ll probably help pick the pastor who officiates, because that’s important to him.

The two had been friends for awhile and started dating last fall, before moving in together in March.

So far, Chris and Lauren haven’t revealed what they’re thinking as far as a wedding date.

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