Erin Callan has had a tumultuous year, hasn't she? The former star at Lehman Bros can sit back and relax today. Not only has she landed on her feet (unlike so many of her former colleagues), it's also her 43rd birthday. Others celebrating: Stone Phillips is 54. Senate Majority Leader Harry Reid is turning 69. Real estate marketing queen Louise Sunshine is 68. Nelly Furtado is 30. Nate Mendel of the Foo Fighters is 40. Monica Seles is turning 35. Lucy Liu is 40. And Ms. Britney Spears—you've heard of her, haven't you?—is celebrating her 27th birthday today.