Khloe K -- MAJOR Nip Slip

"Khloe Kardashian appeared on "Fox & Friends" for just over 6 minutes this morning ... with her right nipple in FULL VIEW the entire time!!! Khloe was wearing a black shirt with see-thru material around the sleeves and part of her chest area -- and during the interview, her boob slipped into the see-thru section for all to see.

Nobody on the set seemed to notice -- but tons of viewers did ... and they bombarded Khloe's Twitter account with messages about the nip slip.

After the interview -- Khloe tweeted back ... saying, "I had a nip slip and I loved it!"  She added, "Thank God! I f**king love nipples!!!!"(tmz)