FATHER AND SON VAN HALEN IN CONCERT

LITTLE DRUMMER BOY!

Valerie Bertinelli beamed with pride when her son -- Wolfgang "Wolfie" Van Halen, celebrating his 10th birthday -- showed off his talent as a drummer during a charity show at his private LA school. But the capper came when Wolfie's rocker dad, Eddie Van Halen, walked onstage and played guitar with his son -- for the first time ever in public! Valerie had forgotten to bring her video camera to record the magic moment and later phoned other moms, hoping somebody had taped it. Sadly, she was told that even though lots of folks had cameras, they'd refrained from taping because Eddie's a celeb and they thought it would be invasive!