Pregnant Kourtney Kardashian and Sisters Pose in Revealing Lingerie

Anyone who thinks Keeping Up With the Kardashians is going to be boring now that the sisters are settling down hasn't seen the new poster promoting the E! show's fourth season.

The promo ad shows Kim, Kourtney and Khloe Kardashian posing in revealing black lingerie.

Teasing, "What a difference a year makes," the poster highlights Kourtney's pregnant belly, newly married Khloe's sparkling wedding rings and Kim's most famous asset -- her booty. 

After airing Keeping Up With the Kardashians: The Wedding last month, the new installment of episodes follows the family as they deal with the changes in their lives.

The new season of Keeping Up With the Kardashians premieres Dec. 13 at 10 p.m. EST.