Should Jamie Lynn Spears, 16 years old and 12 weeks pregnant, show off that growing belly of hers like sister Britney did? Definitely not, says maternity wear designer Liz Lange.

"Britney was into cowboy boots with little dresses,"says Lange. "That was her style. I'd like to see Jamie Lynn go a little plainer. [No] belly baring for her!"

Lange recommends the newly-pregnant Spears look her age.

"She's a young girl, so I would want to keep [her look] innocent," Lange says. "I think little cute dresses and jeans with tight-fitting tee shirts."

As for the magnitude of this life event, Lange says: "I hope she's ready for this -- It's definitely a big step. I know that as a mother myself. But if this is what she wants and what their family wants, then mazel tov."