Chris Brown buys kids Ice Cream

Chris Brown was in L.A. last week, volunteering with theJenesse Center– a non-profit domestic violence and prevention organization — to host their “Back To School Festival” … where youngsters (involved in domestic violence households) were outfitted with school supplies.

Sources tell TMZ … while working the festival, Brown saw an ice cream truck outside the event … and decided to buy all the little tykes and adults in attendance some of the creamy goodness.

We’re told Brown — who has been involved with the organization since 2009 (yeah that year) — wasn’t asked to shell out for the treat … he did it totally on his own.

All in all he dropped a few hundred bucks … but made a lot of kids smile