The 31-year-old singer and the "Hunger Games" actor, 27, welcomed their daughter into the world three months ago, and she feels really lucky that he loves being a hands-on dad, reported Female First.
"He is the cutest dad ever. He's just so there. It's amazing."
Ross said he and the blonde beauty are the perfect team when it comes to parenting.
"Ashlee likes the mornings, so I'll take the night. It works out really well.