Jessica Simpson Eric Johnson Maxwell

Courtesy Jessica Simpson

Being a baby is exhausting!

Jessica Simpson‘s fianc Eric Johnson took his turn at daddy duty – during nap time! – on Tuesday, cuddling up with the couple’s 13-month-old daughter Maxwell Drew to sneak in a few snoozes.

“My loves,” the mom-to-be, 32, Tweeted, sharing the sweet snapshot of her two sleeping beauties.

Capturing an adorable moment between the father-daughter duo isn’t anything out of the ordinary. According to Simpson, Maxwell has quickly become daddy’s little girl.

“If he is in the room, she doesn’t want anybody else to hold her!” she told PEOPLE recently.

But the too-cute twosome better make room for another baby in that bed! After enjoying her Tom Sawyer-themed shower in April, Simpson is set to welcome the couple’s second child – a son – in the coming weeks.