|Jessica Biel (white top) and Mackenzie Rosman of '7th Heaven.'
L'Oreal USA has signed Ms. Biel, who plays the rebellious young-adult daughter in the WB Network's "7th Heaven," to be its newest spokesperson.
The actress in her 20s becomes the youngest of a line that has included such 30- and 40-something divas as Cybill Sheperd, Linda Evans, Heather Locklear and Andie McDowell.
Ms. Biel makes her debut later this month in TV ads for L'Oreal Open hair color from Interpublic Group of Cos.' McCann Erickson Worldwide.
She is in her seventh and final year with "7th Heaven." She also starred in last summer's feature film "Summer Catch" alongside Freddie Prinze Jr. and stars in the upcoming spring film "Rules of Attraction."