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Kristin Cavallari is pulling a Jessica Simpson!

Now engaged (again) to Jay Cutler and pregnant with their first child, the former Hills star, 25, won't be walking down the aisle until after she gives birth.

"I'm not even looking for a wedding dress right now," she told Celebuzz. "I'm pregnant! I'm not going to go try on wedding dresses."

(Due imminently with her first child, Jessica Simpson, 31, similarly put off wedding plans with fiance Eric Johnson until after their child is born; as it happens, Cavallari and Simpson's ex-husband Nick Lachey were romantically linked in 2006.)

After reconciling and announcing their on-again engagement last November, Cavallari and Chicago Bears player Cutler, 28, confirmed they were expecting in late January.

Cavallari added to Celebuzz that she's been getting well wishes from pals all over -- including former Hills mates Heidi Montag and Spencer Pratt.

"Heidi and Spencer actually sent me flowers, which was really sweet," she said.

A pal says in the new Us Weekly that the former wild child is "like a different person" ever since she learned of her pregnancy. "Calm and happy…Jay treats her like a queen!"

A pal says in the new Us Weekly that the former wild child is "like a different person" ever since she learned of her pregnancy. "Calm and happy…Jay treats her like a queen!"