Sophia Bush Sends Sweet Birthday Message to 'One Tree Hill' Co-Star Hilarie Burton

Sophia Bush and Hilarie Burton are total BFF goals!

The 34-year-old former Chicago PD star took to Instagram to share an adorable birthday message to her former One Tree Hill co-star.

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Happiest Birthday to my sweet @hilarieburton. Sister! We’ve been through a lot,” Sophia wrote. “It’s such a thrill to be in this place with you, 14 years after we first met and danced too late in bars — still giddy that we were finally 21 — and to watch you shine. You’re a champion for your community. An incredible mom. You’re the alpaca whisperer.”

Sophia and Hilarie starred in One Tree Hill from 2003 to 2009 when Hilarie left the show.

“There is no one I would have rather been on the world’s most insane roller coaster with,” Sophia continued. “And I’m so glad there’s evidence that we both used to overpluck our eyebrows, undeniably, on the internet forever. At least we’re not alone. I love you mama.”