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Kids were non-negotiable for Rod Stewart's wife, Penny Lancaster .

Lancaster admitted she would have left the musician if he hadn't agreed to have kids with her. "Yes [I would have left him]. And that would have been very hard," she told the British outlet Saga magazine . "But we just went with the flow. Now Rod always says, ‘I wish I’d said yes [to babies] earlier, because then we could have had more children.’"

As recently as five years ago, Stewart and Lancaster considered adoption, but "it ended up not happening."

She explained, "We thought there might be too much of an age gap."

ROD STEWART POSES WITH 4 MOTHERS OF HIS CHILDREN: 'A MOTHER'S REUNION!'

Stewart and Lancaster are parents to sons Alastair Wallace and

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