Katy Mixon has become a first-time mom.
The "American Housewife" official Twitter account and executive producer Aaron Kaplan were among those to offer their congratulations online.
Mixon thanked Kaplan for his well-wishes in a tweet Wednesday night.
"Thank you honey so much!!!" she wrote.
Mixon and Greer got engaged in October after four years of dating. The couple announced Mixon's pregnancy in December, telling People they were "ready to rock 'n' roll."
"We truly are so grateful for this time in our life. We are ready to rock 'n' roll!" the pair said in a statement.
Mixon plays Katie Otto on "American Housewife," which was renewed for a second season on ABC in May.
She is also known for portraying April Buchanon on "Eastbound & Down" and Victoria Flynn on "Mike & Molly."