Julia Roberts wows David Letterman show

JULIA ROBERTS was full of what looked to be genuine enthusiasm the other eve with David Letterman -- as sexy, warm, funny and witty as she has ever been. Julia is a real true star! We're always sad when she goes quiescent and sticks to her private life and it's always a thrill when she re-enters the public eye. (She is out promoting her latest, "Duplicity," co-starring Clive Owen.) Dashing and glamorous in a white suit with a grey blouse and high heels, Julia teased Letterman into a pretended froth and shook her long blonde curls which are now enlivened by a big pink streak in the back. She seemed to be saying the "pink" was a sop to her little girl, but it is her twin son who likes it and says, "Look at my mom's hair!" when they're out in the supermarket.