J.Lo -- The Ultimate HUMBLEBRAG After Scoring Movie Role

Jennifer Lopez FREAKED OUT in the middle of a radio interview ... when she learned (on the air) that she scored a big movie role ... then she proceeded to humblebrag about it.

FYI -- Urban Dictionary defines "Humblebrag" as ... "When you, usually consciously, try to get away with bragging about yourself by couching it in a phony show of humility."

Enter Lopez ... who was in the studio yesterday at Hot 99.5 in Washington, D.C. when she got a phone call (presumably from her agents) informing her she landed a movie role she really, really, REALLY wanted. First she freaks out ... then came the humblebrags.

Our favorite ... "It's a small movie ... but it's a great role ... and A LOT of people wanted it."

She also refers herself as just a "little actress."