Sylvester Stallone is celebrating his daughter Sistine's 26th birthday with pride!

On Thursday, June 27, the 77-year-old Rocky star marked her special day by posting loving photos on Instagram. The post started with a sweet picture of Sistine in a light blue dress, laughing with her dad in a sharp black suit. They also sported matching sunglasses and snapped selfies together.

In the caption, Sylvester wrote, "Happy birthday to @sistinestallone, our amazing daughter who brings nothing but happiness. So so proud to be your father!"

Sistine replied in the comments, saying, "I love you dad!!!🥰❤️🥰."

Her mom, Jennifer Flavin Stallone, also joined in with her own Instagram post featuring baby photos of Sistine.

"Happy birthday to my beautiful daughter, Sistine! 🎉🎂💝💐🌷🌺You have brought so much happiness into my life and I am internally grateful. You are intelligent, kind, hard-working, and my best friend. I love you more than words can express. Mom❤️" she wrote.

Alongside Sistine, Jennifer and Sylvester are parents to daughters Scarlet, 22, and Sophia, 27. Sylvester also has two sons, Seargeoh, 44, and the late Sage, who passed away on July 13, 2012, with his ex-wife Sasha Czack.

In a February interview with PEOPLE, Jennifer shared that her daughters, including Sistine, are focusing on "behind-the-scenes" work in entertainment.

"Sistine is working hard on her script and developing her own projects. She and Sophia also run their podcast [Unwaxed with Sophia & Sistine Stallone] together," she said. "They love doing everything—from writing and directing to producing and editing."

Jennifer expressed her pride in all her children, saying, "I was very involved as a mom, so I've watched them grow into the amazing women they are today. I'm so proud of them. They're making great choices, and I couldn't be prouder."

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