Celebrities aren't immune to weight gain during pregnancy. They just have more pressure to shed those extra pounds.

EnStars put together a list of several celebrities and their baby weight loss secrets.

Nicole "Snooki" Polizzi - The former Jersey Shore star worked out with her personal trainer Anthony Michael and lost almost 50 pounds since giving birth to her firstborn, Lorenzo, in 2012. She also started eating healthier. 

"I work out every single day, and at this point, I'm obsessed," she told EnStars in July. "It's like my aphrodisiac."

Halle Berry - The actress gained 35 pounds with her firstborn Nahla. Her trainer Ramona Braganza told Parents.com that Berry was ready to get back into shape a few weeks after the baby was born. The two would "go for hikes, a jog on the beach, or do kickboxing or yoga."

Jennifer Lopez - The star, who gained 50 pounds during her pregnancy, trained for a triathlon about seven months after giving birth to Max and Emme.

Jessica Alba - The actress followed her trainer, Ramona Braganza's, 321 Baby Bulge Be Gone plan, which is a three-month system. The workout helps a woman's body get back into exercise mode after giving birth.

Heidi Klum - The model, who gained 35 pounds during her pregnancy with Henry, was back on the Victoria's Secret runway just two months after giving birth. The star followed The Ultimate New York Body Plan, a workout plan from her trainer David Kirsch. She worked out for 90 minutes to two hours each day.

Jenny McCarthy - The star gained 80 pounds when she was pregnant with her son Evan. To shed the weight, she did Weight Watchers and worked out regularly. 

Julia Roberts - The actress, who gained around 35 pounds with her third child Henry, did yoga during her pregnancy. She also did one-hour pool exercises after giving birth.

Tori Spelling - The star gained about 40 pounds during her pregnancy with her son Liam. To lose the weight, Spelling started NutriSystem and did daily walking workouts.