Jenna Bush reportedly is expecting her first child! Of the Bush daughters, Jenna has always been the overachiever. Not only is she the first of the Bush twins to get married , but she's also the first to give the former U.S. president and Mrs. Bush a grandchild.

What, exactly, do first daughters do when they're not campaigning for Dad, getting married, and having babies? Jenna is one busy Bush. She currently lives in New York City with her husband, Henry, and their cat, Bernadette, and appears regularly on Today.

In recent years, she's also written two books. Her first book, Ana's story: ...

Happy Birthday to First Daughters Barbara and Jenna Bush (1981), Philadelphia Eagles quarterback Donovan McNabb (1976), actress Christina Applegate (1971), Christian singer Amy Grant (1960), comedic actor John Larroquette (1947), political consultant/actor Ben Stein (1944), Star Trek's "Khan" Ricardo Montalban (1920), New York Yankees legend Joe DiMaggio (1914; d. 1999), industrialist Andrew Carnegie (1835; d. 1919).

Happy Birthday to First Daughters Barbara and Jenna Bush (1981), Philadelphia Eagles quarterback Donovan McNabb (1976), actress Christina Applegate (1971), Christian singer Amy Grant (1960), comedic actor John Larroquette (1947), political consultant/actor Ben Stein (1944), Star Trek's "Khan" Ricardo Montalban (1920), New York Yankees legend Joe DiMaggio (1914; d. 1999), industrialist Andrew Carnegie (1835; d. 1919).

Happy Birthday to First Daughters Barbara and Jenna Bush (1981), Philadelphia Eagles quarterback Donovan McNabb (1976), actress Christina Applegate (1971), Christian singer Amy Grant (1960), comedic actor John Larroquette (1947), political consultant/actor Ben Stein (1944), Star Trek's "Khan" Ricardo Montalban (1920), New York Yankees legend Joe DiMaggio (1914; d. 1999), industrialist Andrew Carnegie (1835; d. 1919).