Alessandra Ambrosio Works Hard At Keeping Off Post Baby Weight

Model mom Alessandra Ambrosio, 28, gave birth to daughter Anja Louise Ambrosio Mazur in August of 2008. Less than four months later she showed off an amazing post baby body on the runway for Victoria's Secret.

"Last year, because I had a baby and I had to lose pounds, I did a lot of cardio,” Ambrosio, 28, told People at Thursday's Los Premios MTV 2009 in Universal City, Calif. "This year is all about weights, squats and lunges."

But Ambrosio says it's not as easy getting underwear-ready this time around. "After I gave birth, my diet was a very healthy diet, like no sugar, no bread," she says. "But now, I am just eating whatever." "I’m working out to prepare for the show because it’s our biggest show of the year,” she says. "I’m trying to work out four days a week."