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No question: Alyssa Milano loves being a mom. 

In honor of daughter Elizabella's first birthday, the 42-year-old actress took to Instagram on Saturday to share a throwback breastfeeding photo alongside a caption thanking her mini-me for entering her life. 

"Happy Birthday, my beautiful Elizabella. You've taught me that my heart has no end. You were the missing piece to my soul. Thank you for choosing me," the proud parent, who is also a mom to son Milo, 4, with husband Dave Bugliari, wrote

READ: Find out why Alyssa Milano shares breastfeeding photos

Milano also stopped by E! News on Tuesday to discuss her new gig as the spokesperson for Atkins, but of course, we also had to get the scoop on little Elizabella's first birthday celebration. 

"She's the second baby, so we didn't have the big party we had with the first baby. She'll probably be in therapy because of that," the former child star quipped. 

"We had a family party," she continued. "And we got her a little smash cake which was her first real taste of sugar…and then she had the most hysterical sugar high you could possibly imagine. She was just flying high, it was adorable. But I think she knew that it was happening because when we were singing happy birthday she looked right at the camera." 

PHOTOS: Alyssa Milano brings baby daughter Elizabella and son Milo to Yo Gabba Gabba! show

As for how Milo acts as a big brother? 

"Pretty much the sweetest thing I've ever seen," the gorgeous mama gushed. "Every hope that you have about having a second one came true with Milo and Elizabella. She worships the ground he walks on, everything that he does she just thinks is amazing and he is so protective of her and sweet with her…I mean, we'll see what happens when she takes his toys away but right now, they're madly in love with each other." 

Too sweet! 

The erstwhile Charmed star also talked parenting with husband David and said they "work really hard at trying to be the best parents we can be because they don't deserve anything less than that."

So, how do the two split parenting duties? Press play to find out! 

PHOTOS: Celeb moms breastfeeding