EXCLUSIVE: Ellie Kemper Talks Pregnancy: 'I'm YouTubing How to Change a Diaper'

Ellie Kemper still she can't believe she's about to have a baby.

ET's Jennifer Peros caught up with the star at the premiere of her new movie, The Secret Life of Pets, at the Lincoln Center in New York City on Saturday, where she gushed about her impending arrival -- and confessed just how much she still has to learn before the little one gets here!

WATCH: Ellie Kemper Adorably Announces She's Pregnant With Her First Child

The 36-year-old actress revealed that her baby is due in August, but she still hasn't wrapped her head around the idea that she'll soon be a mom. "How do you anticipate what's going to happen?" she asked. "We're just going to take it one day at a time. I don't know what I'm doing, so [I'm] very confident in my ability."

The Unbreakable Kimmy Schmidt star looked absolutely adorable at the premiere in a black floral dress and matching flats.

"This is a great dress for pregnancy purposes, I have to say. It's very forgiving," she told ET, before adding that in this stage of her pregnancy, she's having a harder time getting in sleep.

Kemper also revealed that she'll have a little time off after her baby is born before the cast and crew begin filming the third season of Unbreakable Kimmy Schmidt in the fall. "There will be some downtime for me to raise this baby. To swaddle it," she said. "That's what they tell me."

A little downtime is probably a good thing, as The Office alum admitted she still has quite a bit to learn about life with a newborn. "I’m like YouTubing how to change a diaper," she revealed.

Kemper was later joined on the green carpet by her Pets co-stars, Jenny Slate and Lake Bell. The trio all looked very summery in
matching floral frocks. 

EXCLUSIVE: 'Unbreakable Kimmy Schmidt' Stars Ellie Kemper and Tituss Burgess Swoon Over Season 2

The Secret Life of Pets hits theaters on July 8.

While Kemper couldn't stop talking about her impending arrival, Slate was equally as excited on the green carpet. She gushed to ET about her new boyfriend, Chris Evans, who accompanied her to the premiere. See more in the video below.