Oliver Hudson Calls Daughter Rio 'My Partner in Fun' in Sweet 9th Birthday Tribute

https://www.instagram.com/p/CgLJwlgpe-4/ theoliverhudson Verified My ladybug lemon turned 9 today! My partner in fun! She’s fearless and is confident in who she is.. can’t really ask for much more! But when the boys start coming around she won’t like me anymore.. 22h
https://www.instagram.com/p/CgLJwlgpe-4/ theoliverhudson Verified My ladybug lemon turned 9 today! My partner in fun! She’s fearless and is confident in who she is.. can’t really ask for much more! But when the boys start coming around she won’t like me anymore.. 22h
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theoliverhudson/Instagram

Oliver Hudson's daughter is growing up fast!

The Cleaning Lady star, 45, penned a sweet note to his youngest child, Rio Laura, on Instagram Monday in honor of her birthday, writing, "My ladybug lemon turned 9 today! My partner in fun!"

"She's fearless and is confident in who she is.. can't really ask for much more!" he continued before jokingly adding, "But when the boys start coming around she won't like me anymore.."

The pair hugged each other close in the photo, showing off huge smiles as they wore complementary red, white, and blue American flag-themed outfits.

RELATED: Oliver Hudson Gets Adorable Makeover from Daughter Rio: 'The Hair Is Interesting'

It's clear that the daddy-daughter duo have a special bond – in April, the Nashville actor posted a video that showed him getting a glam makeover from Rio, complete with a unique hairdo and winged eyeliner.

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In addition to Rio, Oliver and wife Erinn, whom he wed in 2006, share two other children: sons Bodhi Hawn, 12, and Wilder Brooks, 14.

RELATED: Goldie Hawn Has 'Slime for Your Mind' Playdate with Granddaughters Rio, 8, and Rani Rose, 3

The actor opened up about his family life – and how he adds to the daily "insanity" – during an appearance on The Ellen DeGeneres Show in March, telling guest host  Stephen "tWitch" Boss that his kids are used to his usual antics.

RELATED VIDEO: Oliver Hudson Says Mom Goldie Hawn Has Been Cooking Him 'Great' Breakfasts Since He Moved Home

"They're so used to my insanity that I can't get anything by them now," the Rules of Engagement alum said. "The only thing I can do to embarrass them, honestly, is just being obnoxious in public when they're just like, 'Dad, please chill out.' But I do my best to embarrass them."

"You're not a father unless you're embarrassing your children," he added.