March 29 (UPI) -- Mad Men
actress January Jones made it very clear she wasn't wearing any underwear during her Friday night appearance on The Tonight Show with Jimmy Fallon
by wearing a revealing, lacy black jumpsuit.
The head-to-toe jumpsuit was largely modest except for lacy panels along the side that showed plenty of skin and not a lot of something else that should've been there … her underwear.
While on the show, the 36-year-old actress told a mean story of how she pranked her ex-boyfriend from high school -- who's now a realtor -- into thinking she was planning to purchase a $1 to $2 million home from him.
Take a look:
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