Lancaster, who gave birth to her first child with Stewart, son Alastair, in November 2005, has admitted that the couple is planning another kid and will start trying once (British reality TV show) 'Strictly Come Dancing' gets over.
"We hope there will be another one. We're planning on it and hopefully after Strictly Come Dancing we'll start trying again," Contactmusic quoted Lancaster, as saying.
The 36-year-old photographer also asserted that Alastair's birth has brought Stewart's other six kids from past relationships closer together.
"The children see us as more of a family unit now we've got Alastair. They see that I'm here to stay," Lancaster said.
"I think it makes them feel secure, that it's brought us all much tighter. Having Alastair made us complete," she added.