Kristin Cavallari "Has Already Lost All of Her Baby Weight"

Celebrity Moms Sep. 21, 2012 AT 8:00AM
Kristin Cavallari takes newborn son Camden Jack Cutler for a stroll in Chicago, IL on August 8th, 2012.
Kristin Cavallari takes newborn son Camden Jack Cutler for a stroll in Chicago, IL on August 8th, 2012. Credit: Michael Simon/startraksphoto.com

Kristin Cavallari wasted no time losing the baby weight!

The 25-year-old former Hills star welcomed her first child, son Camden, with fiance, Chicago Bears quarterback Jay Cutler, 29, on Aug. 8.

PHOTOS: Kristin's sexy maternity style

Just five weeks after giving birth, Cavallari "has already lost all the weight by working out like crazy with a trainer," a source tells Us Weekly.

Last week, the reality star tweeted, "Walking uphill on the treadmill to work out this booty. Bye bye baby weight."

PHOTOS: Kristin's best bikini moments

While Cavallari has had no problems losing the weight, there is one thing she's struggling to change after becoming a mom.

PHOTOS: Celebrity pregnancies

"Still need to work on my potty mouth," she tweeted on Sept. 15. "Swearing just comes so naturally to me."

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