Pop star couple Jessica Simpson (search) and Nick Lachey (search) want to go from "Newlyweds" to "Parenthood."

The married stars of the MTV reality series "Newlyweds: Nick & Jessica" tell Us Weekly magazine they plan to start a family in the not-too-distant future.

"I don't think it will be in six months or a year, but after that, Nick's getting old," the 24-year-old Simpson told the magazine.

The 30-year-old Lachey told Us at a Big Brothers Big Sisters event in New York City: "We'd love to have our own children, but we have a heart for kids, and we'd love to adopt."

The couple are considering adopting a teenage child from an underdeveloped country. As a teen, Simpson and her family regularly visited an orphanage in Mexico.

However, cameras likely won't be invited into family life. The couple say this may be the last season for their MTV show.

"Done!" insists Simpson. "We're not newlyweds anymore. We've had our share of the cameras. We're at a point where we'll want everything for ourselves and our family."