Barry Williams and Elizabeth Kennedy
Roger Karnbad/Celebrity Photo
04/04/2012 AT 09:55 AM EDT
He made his name as a member of one of TV's most adored families, and now Barry Williams is expanding his own "bunch."
Williams, 57, who played eldest son Greg Brady on The Brady Bunch
, recently welcomed a baby girl with his girlfriend, Elizabeth Kennedy, according to RumorFix.com
– which reports the new arrival's name is Samantha Rose.
It's the first child for Kennedy. Williams, who now runs The Greg Brady Project
, has a 9-year-old son, Brandon Eric, from a previous relationship.
But he's no stranger to doling out fatherly advice.
When Britney Spears
was going through a public meltdown
in 2008, Williams told the singer she needed to rescue herself