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Beyonce Knowles, Jay-Z

Bruce Glikas/Getty Images

Four years after Jay-Z and Beyoncé said "I do," this power couple's romance is stronger than ever.

Since Hova "put a ring on it" in a super-secret ceremony on April 4, 2008, the famously private pair has continued to enjoy immense career success.

But their greatest accomplishment?

The birth of beautiful baby Blue Ivy Carter on January 7.

And while BIC can't talk yet, she's already shown the world she has her parents' good looks and an impressive set of lungs. Just days after her birth, Blue became the youngest person ever to appear on the Billboard charts.

In honor of Jay-Z and Beyoncé's special day, take a look back at how they fell in love through the years.