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Pregnant Katherine Heigl Lounges Outside in Navy Blue Bikini with Daughter Naleigh

07/05/2016 at 09:15 AM ET

Katherine Heigl spent some time in the sun this Independence Day weekend, relaxing in a navy and white striped bikini with 7-year-old daughter Naleigh Mi-Eun.

“Hope you all celebrating had as chill a 4th of July as Naleigh and I,” the 37-year-old actress captioned her Instagram pic.

While her growing baby bump wasn’t in full view, Heigl and Naleigh were all smiles, mimicking one another in the same laid-back pose. “#Gratefulgirls #thisisthelife” the mom-to-be hashtagged the shot.

Katherine Heigl pregnant bikini
Katherine Heigl/Instagram

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Heigl just announced her first pregnancy with her husband of eight years, Josh KelleyTheir son, due in January, will join big sisters Naleigh and Adalaide Marie Hope, 4 — whom the couple adopted in 2009 and 2012, respectively.

“It was totally unexpected but thrilling,” Heigl wrote on her blog after sharing her exciting news exclusively with PEOPLE. “The whole pregnancy thing is new to me, but the thrill of having a baby is not.”

RELATED VIDEO: Katherine Heigl Is Pregnant! Baby Boy on the Way for Actress and Josh Kelley

“Naleigh and Adalaide are over the moon and [cannot] wait to spoil their new sibling rotten,” she wrote, adding that she and her singer-songwriter husband, 36, are “full of high hopes and bubbling anticipation.”

“This is truly an amazingly blessed time, waiting for the child you’ve been dreaming of to make their appearance,” she continued. “Though I’ve never been a particularly patient person, my experience of waiting for Naleigh taught me a lot in that department.

— Dave Quinn

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Meghan on

Can’t believe how fast her girls are growing! Seems like only yesterday they were announcing that Naleigh was part of their family.

Barbara on

Best wishes to Mother and Dad Kelley! The girls’ little brother will be a thrill, they’ll spoil him,. Then someday in the future you’ll hear “Mom, Daddy! He’s being a pest!”. That’s all part of the thrill for you. Enjoy the love.

Barbara on

P.S. Are you lining up the names for him yet??

Alicia on

Yay her daughter is so cute.

sumner80 on

I don’t agree. – Laila