Days after posting a picture of himself cuddling up to Pretty Little Liars star Keegan Allen, Franco uploaded a nearly nude selfie to his Instagram account. The unexpected muse behind this bold snap? Britney Spears.
"Like that Britney Spears shaved-head moment, where it's sort of like, 'All right, you want me? Here, you can have me, but I am going to be really ugly.' You know what I mean?" Franco said to Letterman about the attitude behind the now-infamous shot.
The audience responded with laughter, but the 36-year-old insisted he was serious. Franco's barely-there photo was later removed from his Instagram, but not before many of his 2 million followers saw the selfie.
Watch Franco's full explanation to Letterman below.