From celebrity-babies.com:
Tallulah Belle Willis, 13, commissioned dad
Bruce to make an announcement during his appearance on The Late Show with
David Letterman last night.
"
Tallulah wanted me to mention on here tonight that she's legally changing her name from
Tallulah to Lulah. Just Lulah. Doesn't like her name, doesn't like
Tallulah. She's legally changing it."