But the 36-year-old blonde, 26 years Rod's junior, still hasn't got used to the Stewart family's summer routine.
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Rod and Penny prepare for some family fun
"August is always the month when Rod's daughters Ruby and Kimberly come to LA," she was overheard telling a friend at a garden party last week.
"We have to put our diaries on hold for the month to fit around their schedules."
Kimberley, 27, and Ruby, 21, are, of course, always welcome chez Stewart.
"We love having them," said Penny.
"But you never know when they'll be home. It's also Kimberly's birthday that month so there'll be lots of parties to organise."
Rod and Penny at Buckingham Palace earlier this week where the singer collected his CBE
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