We have an update on Shauna Sand's arrest last night for domestic violence.

First, we've learned that the trainwreck stands accused of spraying mace into the face of husband Laurent Homburger. The incident went down after an argument that was initiated because Sand told Homburger she wanted a divorce and locked herself in the bathroom...

... only for Laurent to kick the door down and Shauna to pull out the pepper spray.

In response to the arrest, TMZ confirms that Lorenzo Lamas - who has three kids with Shauna - has filed documents in court to attain a temporary order that would grant him physical custody of their daughters, ages 10, 11 and 13.

"I am concerned for the welfare of my children," Lamas tells TMZ. "I will not allow them back in that household until Shauna and her husband receive anger management treatment."

[Photo: WENN.com]