Mean Girls actress Lacey Chabert is pregnant with her first child.

We have some news that is so fetch – Mean Girls actress Lacey Chabert is expecting her first child with husband Dave Nehdar.

The 33-year-old announced she was pregnant via Instagram, by posting a photo of her dog Kitty wearing an outfit bearing the words, “My mom is having a baby and all I get is this silly shirt”.

It was captioned with the words: “Kitty doesn’t seem as excited as we are about this … I’m pregnant!!!! My husband and I are thrilled and so thankful.”

Kitty doesn’t seem as excited about this as we are… I’m so happy to share the good news that my husband and I are expecting a baby later this year! We are thrilled and so thankful for this blessing ?? #pregnant

A photo posted by Lacey Chabert (@thereallacey) on Feb 27, 2016 at 10:43am PST

Chabert’s fans and followers were quick to congratulate the former child star on her big news – and her cute (and unique) pregnancy announcement.

poneegirl27 wrote “Congratulations and I love that your chihuahua helped make the announcement!!!!” while brittneymo posted “Congratulations to you and your husband!!”

Chabert and Nehdar married just over two years ago, and the former Party of Five actress described her husband as “my best friend and love of my life”.

Chabert rose to fame in 1994 with her role as Claudia Salinger in Party of Five, alongside fellow teen star Jennifer Love Hewitt. She went on to be a huge star of the late ’90s and noughties, voicing  Eliza Thornberry in the animated series The Wild Thornberrys and landing roles in a string of movies such as Daddy Day Care, Lost in Space, Not Another Teen Movie and Black Christmas.

However, it was her role of the ditzy Gretchen Wieners in the cult teen movie Mean Girls that really made her a household name.

The baby is due later this year - and we're sure he or she will be completely adorable.

How did you announce your pregnancy?

TAP on the image below and scroll through the gallery of our favourite Lacey Chabert roles...