E! may get a commission if you purchase something through our links. Learn more.

If you have Maxwell Caldwell"Agatha All Along" stuck in your head, you're not alone! And you can thank Kathryn Hahn aka Agatha Harkness in the hit Disney+ shows Agatha All Along and Wandavision for the catchy tune.

We caught up with the three-time Emmy-nominated actress to find out what items she can't live without.

In addition to always having rose lip balm, 9 Elements multipurpose cleaner and Aquaphor on hand, Kathryn shared being with her family makes her the happiest. "We can be anywhere, doing nothing, but I'm happiest when I'm with them."

And if you're wondering how someone as busy as Kathryn relaxes, she told E!, "When everything on my to do list is checked off and I can truly be in the moment."

Below, the Tiny Beautiful Things actress rounded up the things she can't live without, and they couldn't be more relatable!

"I love all of their products because my hair is so dry – this has helped bring life back to it."

"This is the only thing that seems to penetrate my lips for moisture in this dry weather!"

"My eyes get so dry so I cannot live without these drops."

"It's my remedy for everything."

"I genuinely would not be able to function in life without this product. It simplifies cleaning for me, you can use it on any surface and it prevents hard-water build-up. I love both the eucalyptus and lemon scents."

"I have this gallon water bottle that I got on amazon which has prompts with affirmations up to the gallon. I love it."

Ready for more celeb must-haves? Check out the things Constance Zimmer can't live without!

—Originally published Sept. 19, 2021 at 1 p.m. PT