They were born May 14. Out of tradition, the zoo didn't send out a birth announcement until now because it wanted to make sure the mother and babies were in good health.
Two other cubs were born last year to the same parents.
The cats, known for their gorgeous pelts, are threatened by poachers and loss of habitat in Southeast Asia and parts of China. The Smithsonian National Zoo says it is hard to estimate how many there are in the wild because they are reclusive.