Bruce Springsteen, Jimmy Fallon

Jimmy Fallon — or should we say Neil Young? — wasn't afraid to show the passion in his pants on Friday's Late Night with Jimmy Fallon.

The talk show host impersonated the classic rocker once again in a duet with guest Bruce Springsteen. This time, the pair sang LMFAO's "Sexy and I Know It."

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Last year, Springsteen, recreating his Born In the USA look from the early '80s, teamed with Fallon (as Young) to perform Willow Smith's "Whip My Hair."

Springsteen's appearance and subsequent musical performances on Friday were part of a week of Late Night shows dedicated to the rocker, whose new CD hits stores Tuesday.

Watch "Young" and Springsteen take on LMFAO here: