Kellie Martin Welcomes Daughter Olivia James

02/18/2016 at 06:00 PM ET

Kellie Martin‘s little lady is here!

Born Saturday, Feb. 13, daughter Olivia James Christian weighed in at 7 lbs., 15 oz. and measures 20 inches long, her rep tells PEOPLE exclusively.

Olivia joins big sister Margaret Heather, 9.

The actress announced the arrival of her second child with husband Keith Christian on Twitter Thursday.

“She’s finally here,” Martin, 40, captioned a photo of her two girls.

Kellie Martin Welcomes Daughter

This pregnancy won't end. But I do love a good romper. #39andahalfweeks @loyal_hana

A post shared by Kellie Martin (@thekelliemartin) on

The former ER star was five months along when she announced she and Christian were expecting another baby. But due to her severe morning sickness, Martin’s big reveal to her firstborn came much earlier on in the pregnancy.

“She took the news really, really well,” Martin said of daughter Maggie during a segment on Hallmark’s Home & Family in September.

“I told her way earlier than I expected to because I was so sick that I didn’t want her to think there was something wrong with Mommy.”

Someone's getting pretty excited to be a big sister @orbitbaby

A post shared by Kellie Martin (@thekelliemartin) on

Trying to decide who has the biggest belly #KevinBacon #Hamlet #Frank #Kellie

A post shared by Kellie Martin (@thekelliemartin) on

Milestones for me and baby #40years #6months

A post shared by Kellie Martin (@thekelliemartin) on

And Maggie has been prepping for her new role ever since finding out she had a baby sister on the way. In between sharing sweet snapshots of her growing bump, Martin has posted several photos of her daughter giving her baby belly love and testing out the new stroller.

“Someone’s getting pretty excited to be a big sister,” the mom-to-be captioned a picture of Maggie trying out her sister’s new ride with a teddy bear.

— Anya Leon with reporting by Gabrielle Olya

FILED UNDER: Babies , Births , Kellie Martin , Kids , News

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Showing 16 comments

Marilyn on

Big sister loves her new baby sister. They’re both so cute.

What??? on

Cute photo of her two girls together.

Mrs. B on

Congratulations on the new arrival. Both girls are adorable.

Anonymous on

Congratulations on her new addition!

Gretchen on

What a cute picture of the two girls together! Congratulations to the happy family; love the name Olivia, as well! Both girls have lovely names …..

Rose on

The picture of her older daughter with the new arrival is so cute.

aquariusinaz on

Adorable pictures! Congratulations Kellie & family!

Guest 3 on

Congrats !
It’s awesome bringing a new life into the world ……Love the baby’s name !

MJ on

So sweet! Big Sister and baby sister – simply precious, Kellie seems like a wonderful mom – very down to earth!

Vanessa on

It’s funny she is comparing her belly with the pigs.

Johanna on

It bothers me that everyone is giving their daughter the middle name James now. A little originality would be great.

Brooke on

That PICTURE of the two sisters….Absolutely precious.

And apparently James is the new Rose, Marie or Lynn….middle name trend of the day

Anonymous on

So happy for them! Congrats.

Mia on

The picture of her older daughter with the horse is so cute.

Anonymous on

Ruth, what? Not sure what you are talking about. I read the article a few times, so I may be missing something. She is not too old to be having a baby for starters. Also, 24/7 crying? Seriously? What baby cries 24/7? Not sure why you think that about her a baby.

Carrow on

She’s more beautiful now than when she was younger and she looked amazing while she was pregnant.