Chris Brown -- Caught Being A Nice Guy

Who screams for ice cream? Chris Brown screams for ice cream ... and so did the 60 plus kids he bought it for last week in a random act of kindness ... yup, we said kindness ... and Chris Brown.

The singer was in L.A. last week, volunteering with the Jenesse 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.