Heidi Klum threatens to show too much skin as carrying Lou drags her neckline south



Heidi Klum often tries to blend in with the other mothers when she shepherds her children to their weekend karate classes.



So perhaps the supermodel didn't realise she might be putting on a show today in Los Angeles with her plunging neckline and revealing dress.



The German model, who turned 39 yesterday, commanded attention in the low cut black dress, that had a revealing slit on the side.

Risque business: Heidi Klum almost revealed too much when she stepped out carrying daughter Lou

As the breeze blew, the skirt flew back, showing off her toned legs.

Her blonde hair was pulled back into a ponytail, revealing the Project Runway host's perfect bone structure.

Heidi looked stunning while carrying daughter Lou .

Going South: Heidi's top was slipping down as Lou clung onto it during the journey

A low blow: Heidi Klum wore a low cut dress on Saturday in Los Angeles as she took children to karate class



The mother-of-four paired her frock with black gladiator sandals and silver jewellery.

The star's children didn't seem to mind her ensemble though and appeared much more focused to getting to their classes.



Heidi was also sporting jewellery on her wedding ring finger, suggesting she may be missing having her sparkler and rock there.

Weekend ritual: Every Saturday Heidi accompanies her children to karate class



Ready to cut loose: Heidi's children walk inside the building for their weekly class



Missing having a rock on your finger?: Heidi sported jewellery on her wedding ring finger

The children's father is British musician Seal; he is also the adopted father of Leni, Heidi's daughter with Flavio Briatore.

Heidi and Seal announced their separation in January of this year after seven years of marriage.



She has gone about her business, trying to move on after the split by throwing herself into her work and devoting time to her kids.

Klum recently returned from the Cannes Film Festival, where she auctioned off a massage at the amFAR charity gala.

Multi tasking: Heidi and Lou shopped while the other kids were at their class