"She's already doodling baby names on scraps of paper. She's been bragging about how beautiful their children will be, because Taylor is so handsome," contactmusic.com quoted a source as saying.
"She wants everything with him — love, marriage and a family. But she's set on becoming a mother before they think about anything else and she's talking about giving birth in the next year."
The couple is said to have just returned from a trip to Kinney's hometown of Lancaster, Pennsylvania, where they broke the news to his family.
His aunt Kathryn Loh said: "There's no doubt he loves her and she loves him. Now everyone's met her, we love her too! They are perfect together.
"I'm so glad we got to meet the woman behind all the make-up and the outfits. She's very well-spoken and down-to-earth. She's basic — a sweet, normal, healthy person."