Allison and Levi have been dating for two years before he asked Allison to marry him. In modern day fashion he had someone on hand to take pictures of her reaction AND her dad's reaction.
He had his own plan for this. In the background you can see him holding a sign that says "SAY NO."
Allison says her dad does approve of the new fiance. He's just a "goof."
She went against her father's wishes ;) and said yes!