Happy Birthday To Two Gorgeous Stars: Bradley Cooper And January Jones!

What does an elementary school teacher suffering from a Las Vegas-induced hangover have to do with an emotionally neglected but suddenly empowered housewife from the 1960s?

They're both fan-favorite characters from "The Hangover" and "Mad Men," played by Bradley Cooper and January Jones, and both happen to be celebrating their birthdays today!

Bradley, who turns 35 today, first launched to prominence with his role as Will Tippin in "Alias." Bradley played Will as a comedic but lovelorn everyman that happens to get drawn into the espionage game thanks to his sadly platonic relationship with super spy Sydney Bristow (Jennifer Garner).

Following his departure from "Alias," Bradley went on to star in a number of high profile films such as "He's Just Not That Into You," "Wedding Crashers" and, of course, "The Hangover." He'll next be seen taking on the role of Templeton "Faceman" Peck in "The A-Team," and was nearly a lock to play Hal Jordan in "Green Lantern" before losing the role to Ryan Reynolds.

January, who turns 32 today, is undoubtedly best known as Betty Draper on "Mad Men," the critically acclaimed and award winning AMC series that focuses on an advertising agency and the social climate of America in the 1960s. Despite often succumbing to the strict, cold edicts of her husband Don (Jon Hamm), Betty made some surprising moves to bolster her own emotional self-worth during the show's most recent season.

But while "Mad Men" is her most prominent role to date, January is becoming more and more of a fixture in the acting scene outside of the beloved television series. She recently hosted an episode of "Saturday Night Live" and is currently filming "The Hungry Rabbit Jumps," an intense thriller starring Nicolas Cage and Guy Pearce.

Just as everyone has an opinion, a favorite meal and a nose — albeit a fake one at times — so too does everyone have a birthday... even celebrities. Here at Birthday Bash, it's our mission to salute the Hollywood heroes that are celebrating their special day this week. You can wish Bradley and January a happy birthday in the comments section below!