During their reality television days, Kristin Cavallari and Lauren Conrad could barely be in the same room together without drama.

But recently, Cavallari, 26, has been seen in a dress designed by Lauren Conrad, 27, prompting speculation that they may have put the past behind them.

Cavallari, who recently had a baby boy with fiancé Jay Cutler, quarterback for the Chicago Bears, wore the black "Jasper" dress for a shoot with Splash Chicago in February. The dress is from Conrad's Paper Crown line and is currently on sale for $238.70, according to Us Magazine.

The new mother said in the Dec. 3 episode of Watch What Happens Live that though much of the drama on The Hills was fake, her dislike of Conrad was not.

But when host Andy Cohen asked her to say three nice things about Conrad on a round of plead the fifth, she didn't hesitate when she said, "She is a very pretty girl... she's very successful, and we actually have had a lot of really fun nights together, so she can be a lot of fun."

Cavallari will have a special on E! this Sunday with Guliana Rancic where she will discuss being a mother to seven-month-old Camden and her and Cutler's wedding plans.