One of the most successful, buzzed-about singers in all of music turns 26 years young today. Happy birthday to Stefani Germanotta, a.k.a. Lady Gaga!

The only question is how the New York native will celebrate.

Posted in: Lady Gaga

A pair of beauties, one for each gender, celebrates a birthday today.

First, Twilight Saga star Kellan Lutz is 27. The actor appeared on 90210 briefly during that CW drama's first season and has proceeded to explode on to the movie scene thanks to his role as Emmett Cullen in Twilight, New Moon and Breaking Dawn.

Posted in: Kellan Lutz

Carrie Underwood, the beautiful pride of Checotah, Okla., and one of the most successful American Idol contestants in history, hits the age of 29 today.

Her four studio albums have sold more than 15 million copies in the U.S., already placing Underwood among country's all-time greats before the age of 30.

Posted in: Carrie Underwood

Justin Bieber will appear on an episode of Ellen today for two reasons:

Indeed, the teenage icon is 18 years old as of this morning, so you can feel less illegal/guilty for picturing him naked, ladies. In honor of the occasion, he made a big announcement during his Ellen interview:

Posted in: Justin Bieber

For about five million "Leaplings" or "Leapers" in the world, today is special. A person born on the quadrennial 29th of February only gets a birthday every four years!

The coolest thing about having a birthday on Leap Day? Becoming a walking, talking conversation piece by virtue of being born. The downside? The other three years.

Posted in: Celebrity Birthdays