The Girls star clearly came to win – she even wore a sporty Nike outfit. “I wanted to take this seriously and I needed room to flex,” she explained.
“I am facing a worthy opponent,” Fallon admitted.
He kicked off the competition singing the 1982 camp classic “I’ve Never Been to Me” by Charlene.
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Next Dunham took on Calvin Harris’ “Outside.” And that’s when she busted out the floor-writhing choreography.
Fallon came back with Run-DMC’s “Run’s House,” but Dunham easily won the battle with her next song – Queen’s “Fat Bottomed Girls.”