Liv and Bebe in the Boom Room

10/9/2007 12:25 PM PDT

Liv and Bebe in the Boom Room

Like mother, like daughter? Not so much.

While Liv Tyler's model mama Bebe Buell bared all for breast cancer awareness, her daughter and mother Dorothea Johnson took a more demure approach.

As Liv posed for pics with mom and grandma, she quipped,
"TMZ -- aren't you the naughtiest website of all time?" And Mom Bebe mimicked TMZ's video clip intro music. "Boom, boom, boom!"

She's a fan!