Emma Watson celebrates a birthday today.

And although it may seem hard to believe - because she's been in our lives for so long and because she comes across as more mature than many celebrities twice her age - the young woman behind Hermione Granger is only 22 years old.

Posted in: Emma Watson

Jennifer Lopez celebrated her dancer boyfriend Casper Smart's 25th birthday Friday night with an intimate dinner party - and a giant ass pickup truck.

"Jennifer had planned a fun day to celebrate Casper's birthday," a source says of the day that ended with Smart's customized white Dodge Ram truck.

Posted in: Casper Smart

It's Kristen Stewart's birthday on this 9th of April - her 22nd!

The Los Angeles native racked up an impressive number of film and TV credits even before 2008, when the Twilight saga launched her to mega-stardom.

Posted in: Kristen Stewart

Alec Baldwin turns 54 years old today, but he went ahead and gave himself an early birthday present over the weekend. The actor proposed to yoga guru Hilaria Thomas!

We send our very best to this newly-engaged couple, while also sending our birthday wishes to the Capital One spokesperson/Oscar nominee/unparalleled Saturday Night Live host/30 Rock star behind the Jack Donaghy quotes that crack us up on a weekly basis.

Posted in: Alec Baldwin

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