Farrah Abraham almost gave a free show to everyone at a Los Angeles beach this weekend ... 'cause while she was posing in a tiny top it almost slipped off and revealed everything!

The model and former reality TV star enjoyed a little fun in the sun on Friday ... pulling up to a pristine SoCal shore in a two-piece bikini with thong-style bottoms. Mega

Check out the pics ... FA setting the beach on fire in a bright orange outfit -- and, while she was snapping selfies near a lifeguard tower, her top raised up on her chest.

The bottom half of Abraham's breasts are totally out here ... leaving little to the imagination in these photos. Mega

To be fair, the material did little to hide her nipples before ... so, even though this wardrobe might've malfunctioned a bit, it's not like the

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