Bye-bye, baby bumps! Hello, hot bodies. Though shedding weight after baby can be almost as difficult as giving birth, there's more pressure than ever for Hollywood moms to slip into their skinny jeans right after their children are born. From Kim Kardashian to Beyonce, click through to check out how star mommies have transformed their bodies after baby, starting with Mila Kunis. Apparently Ashton Kutcher's baby mama kept trim during her pregnancy by taking yoga classes. The first-time mom looked happy and healthy after a workout in Los Angeles on Aug. 23, 2014. Just a month later, she gave birth to her daughter, Wyatt.