Motherhood is already changing Chrissy Teigen, at least Online.

The new mom, never one to hold back from sharing her thoughts, took to Twitter this week to gush about her new life, but she also humorously joked that she didn't know how to act anymore because she's now a mother.

"Thank you for all the well wishes!!! We are so happy and excited!," she tweeted after her daughter's birth. "I dunno what to tweet now. Does my twitter change? This is so awkward."

Chrissy is learning that motherhood has it's own challenges for her, as well.

"No one told me I would be coming home in diapers too," she tweeted.

Chrissy and her husband John Legend have been over the moon about the birth of their daughter. This week, they shared several adorable images of their little bundle of joy, Luna Simone Stephens.

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A photo posted by chrissy teigen (@chrissyteigen) on

"Hi my lulu!" the Sports Illustrated model captioned an Instagram snap of her and daughter. She and John later shared another image that fully shows the little cutie's face.

Although Luna is only a week old, her mom is already thinking about the struggles her daughter will face in school, particularly when it comes to common animal questions.

"I just realized that when luna's teacher asks how many legs a dog has, she will really not be sure," Chrissy said, referring to their adopted three-legged dog Penny.

While Chrissy is clearly loving motherhood, she and John caught some flack several months back after they announced that they had chosen to have a girl via in vitro fertilization.

"I've made this decision," she told People magazine in February. "Not only am I having a girl, but I picked the girl from her little embryo. I picked her and was like, 'Let's put in the girl.'"

However, not long after Chrissy's decision to choose a girl were made public, many took to social media to blast her, implying that she was handpicking qualities that she wants, rather than letting nature take its course.

The often-outspoken model, though, was quick to defend herself to the twitter-haters.

"My natural blessing from God was infertility," she tweeted.

In a separate tweet, she said, "What year is this!? And for the record, I am always happy and open to speak on infertility. The more casual, the better! I don't mind."

As the criticism continued pouring in, she said, "I also picked the embryo with a taste for bacon, a knack for magic and size 7 feet so she can always find shoes."