Hilary Duff Steps Out in Bikini With Baby Luca in Mexico Sporting Massive Weight Loss [PHOTOS]

Just three short months after having her first baby, former Disney star Hilary Duff stepped out in a bikini with new son Luca, showing off her post-baby body in paparazzi photos.

Duff, 24, and three-month old Luca were snapped in photos by the water in Mexico on vacation with sister Haylie Duff and mother Susan Duff, Us Weekly reported. Duff was wearing a flattering black bikini and large sunglasses, holding Luca who was wearing a giant orange bucket hat and baseball tee.

The actress and her husband, Mike Comrie, welcomed baby Luca in to the world on March 20, and it appears Duff has been hard at work to shed the baby pounds.

"I think if you ask any pregnant mom, they're like 'I want my body back,' but it takes time," Duff told US Weekly in early June. "It takes nine months for your body to get that way and it's putting on that weight on purpose."

While she is certainly looking great these days, Duff said she has a long way to go.

"Obviously, I'm not where I want to be eventually, but I'm working hard and I'm doing everything I can to lose the weight the right way. The second I start to get down like 'what happened to my body,' I look at my beautiful baby and I've never been more appreciative for this body that I have."

Duff was the subject of scandal just two weeks ago when she was photographed holding a lit cigarette outside Rock N Reilly's Irish Pub in West Hollywood. After the photo went viral on the Internet, angering many that the squeaky clean actress known for her role in Disney's "Lizzie McGuire" would start smoking, Duff addressed fans via Twitter.

"Yikes me holding a cigarette for my friend might have been a bad idea! pretty bummed about the photo ... Sorry guys, looks worst than it is!" she tweeted.

View the slideshow to see photos of Hilary Duff and baby Luca.

Just three short months after having her first baby, former Disney star Hilary Duff stepped out in a bikini with new son Luca, showing off her post-baby body in paparazzi photos. Duff was wearing a flattering black bikini, which showcased her massive weight loss, and large sunglasses while holding baby Luca.

Hilary Duff's squeaky clean image has not left her. From her days as Disney star "Lizzie McGuire" to her charity efforts to her role as a new mama, Duff has maintained a flawless image. Until she was caught holding a lit cigarette.

Hilary Duff showed off a slim figure in leather-paneled leggings and a wide-brimmed hat on Saturday.

Hilary Duff gave birth to baby Luca Cruz just nine days ago; but the new mother already looks unbelievable.

Hilary Duff hit NYC in October to promote her second book, "Devoted."

Hilary Duff looked stylish throughout her pregnancy, wearing cut chunky sweaters and even mini skirts!