February 11, 2016 03:00 PM

Ashlee Simpson slimmed down in no time!

The singer and actress, 31, quickly dropped the baby weight after the birth of her daughter Jagger Snow — around 40 lbs. — in just five months with the help of her trainer, Ramona Braganza.

“While it’s often tougher to lose the baby weight the second time around, it is possible!” Braganza tells PEOPLE.

“Seven years ago, after the birth of her son Bronx, Ashlee lost 25 lbs. in two and half months. This time around, at 30, with slightly more weight to lose, what helped her drop a consistent two pounds a week was exercising five days a week and burning 800 or more calories per workout session.”

Ramona Braganza

Braganza put Simpson on her 3-2-1 Baby Bulge Be Gone program, which starts by focusing on core work, and then slowly ramping cardio and strength training back up to look lean and toned.

Simpson also revamped her diet, eating three meals and two snacks a day of nutrient-rich superfoods, and chugging down at least a liter of water along with metabolism-boosting teas.

But what really got Simpson to the finish line, Braganza says, was the support of husband Evan Ross.

“Having a hands on daddy like Evan proved to be a big motivation,” Braganza says. “Taking turns watching his daughter as his wife worked out, prepping some post-workout snacks and performing nighttime daddy duty proved to be a big part in Ashlee’s weight loss success.”

Ross even joined in on the workout fun, with his own “Daddy weight loss mission,” Braganza says.

“It was a chance for him to step up with his workouts. We trained either before or after Ashlee’s sessions, following my 3-2-1 Training Method. He leaned out and bulked up for his shirtless scenes on Wicked City.”

— Julie Mazziotta

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