Miranda Kerr must have broken a world record of some kind after showing off a tiny bikini in Malibu on a Victoria's Secret shoot just three months after giving birth to her son, Flynn. See the pics of Kerr here. Was it a miracle worthy of Angels (fellow VS model-moms Gisele Bundchen, Heidi Klum and Karolina Kurkova also managed to pull it off) ? Or a feat achieved with Kerr's virtuous diet (fruit, veggies, fish) and marathon breastfeeding, which burns 500 calories a day? Check out our list of other celebrities who've ditched the baby weight and made a dramatic body comeback in jaw-dropping time. Three months after my son was born, I was still rocking my maternity jeans and could barely muster up the energy for Stroller Strides. But maybe that's because I refueled from nursing with lots of 500-calorie milkshakes. Break even, right?

In one month:

Rebecca Gayheart and Sarah Michelle Gellar look svelte enough in jeans to make us do a double-take ("Didn't she just give birth...?")

Nicole Richie manages, once again, to look alarmingly skinny.

In two months:

Jennifer Hudson's curves reappear.

Leelee Sobieski says "Welcome back!" to her flat stomach.

Ana Ortiz says "Bring it on" to the skimpy outfits of her character on "Ugly Betty."

In three months:

Kourtney Kardashian wears a bikini...for a magazine cover.

Kendra Wilkinson shimmies back into her workout clothes.

Padma Lakshmi slims down just in time to taste more food. (Check out her favorite spring recipe here.)

In four months:

Bundchen zips up a Herve Leger bandage dress.

Kurkova cinches a black blazer over a sheath.

In five months:

Ellen Pompeo re-debuts her skinny jeans.

Blogger Melissa Pheterson

Melissa Pheterson is a health and fitness writer and trend-spotter. Follow her on preggersaspie.comand on Twitter @preggersaspie.