The 'Breaking Bad' star also revealed that his friend and former co-star, Bryan Cranston, has already met his little girl and is 'madly in love with her.'
The new parents stopped to talk with ET's Lauren Zima during a very rare date night together at the 25th Annual Race to Erase MS Gala at The Beverly Hilton hotel in Los Angeles on Friday night, and they couldn't help but admit how they already missed their bundle of joy during their "parents' night out."
"We've had a couple nights but we just don't want to be away from her," the new mom shared. "She's just the best, and so fun!"
Aaron and his wife -- who tied the knot in 2013 at a ceremony in Malibu, California -- have been one of Hollywood's sweetest couples since their wedding, but the pair admitted that welcoming a baby has made their relationship even stronger.
"It's amazing," Aaron marveled.
"You can't imagine that you could love each other even deeper than you already do," Lauren chimed in. "But I think it's just so cool, you know? We weren't blood-related before, but now there's this human that we're both related to and it makes us family in a new way, which I think is so special."
While the two proud parents are overjoyed at the new addition in their life, they aren't the only ones head-over-heels for their baby girl -- according to Aaron, his long-time Breaking Bad co-star and close friend Bryan Cranston has "of course" gotten a chance to meet their little girl, and "he's madly in love with her."
"Both him and his wonderful wife, Robin [Dearden]," the actor added. "It's the best"
While the adoring new mom admitted that being away from their baby girl felt "like a piece of your body is away from you," the two still made sure to get a babysitter so they could come out to support the Race to Erase MS Gala -- the proceeds from which go to research efforts seeking a cure for Multiple sclerosis.
"One of the greatest men I've ever met in my entire life, my father-in-law, [Lauren's] father, was diagnosed with MS 13 years ago, pretty much to the day, today," Aaron explained. "So anytime there's a light shined on this terrible disease, creating this sense of community, it's a beautiful thing to talk about."
"We're really happy to be out here tonight supporting this amazing organization," Lauren added.
For more on the cute family's precious new addition, check out the video below.