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.

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.

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 average beachgoer wasn’t seeing pretty much everything anyway.

Abraham enjoyed the beach on Friday — before coming by “TMZ Live” to promote her appearance on the “TMZ After Dark” tour Saturday.

If ya don’t know … we’re now taking you across L.A. to see some of the city sights — including iconic bars like Saddle Ranch Chop House and a whole lot more while partying the night away.

Celebrity guests — like Ray J, Chanel West Coast, Jerry O’Connell — have hosted in the past … and, this weekend it was Farrah Abraham’s turn on one tour Saturday night, while Master P hosted another.