TMZ has obtained pictures of Octomom Nadya Suleman's home that have triggered a police and child services investigation into allegations that her 14 kids are living in horrendous conditions and are being grossly neglected.

Suleman's hairstylist, Stephanie, went to La Habra, Calif. cops Tuesday afternoon and filed a formal complaint.

PHOTOS: The photos that triggered the investigation.

A La Habra cop and three reps from the Orange County Department of Children and Family Services went to Suleman's house Tuesday night to investigate.

One photo shows two children pooping in a portable training toilet in the backyard.  We're told the plumbing in the house is shot, and only one toilet is operational.

"The kids are in desperate need of help"

- Octomom's hairstylist

Another photo shows Suleman just after she got her hair done. What's shocking is that she locked her kids in the bedroom by propping a chair against the door so they couldn't get out.

Yet another pic shows the children's bedroom, with two cribs and a mattress. Stephanie told cops some of the kids are forced to sleep on the floor.

And there's more. One photo shows some of the kids in the backyard, barefoot, dirty and wearing no pants.

"The kids are in desperate need of help, and I tried to help and she's not open to anyone helping her," Stephanie told TMZ. She says the boys are wearing girl's clothes, they are neglected, and Suleman is incapable of caring for them.

Authorities stayed at Suleman's home Tuesday night for an hour-and-a-half, and determined the kids were not in danger.  There will, however, be follow-up with Children's Services.