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The singer showed up at the 55th annual
The last time Lopez created such a stir at the Grammys was in 2000 when she wore a low-cut green Versace gown that dipped down to her stomach.
Earlier last week, an internal CBS memo leaked warning talent to avoid "thong type costumes" and asking that "buttocks and female breasts are adequately covered."
When Lopez took the stage with singer Pitbull to present, she addressed her bare leg.
"As you can see, I read the memo," said Lopez. "Whatever you're wearing, or not wearing, this party is worldwide." Watch the clip below: