Conan O'Brien and Chelsea Handler have done some wild stunts on their late-night shows, but we're pretty sure that this is a first!

Conan returned to his old studio for the first time since his Tonight Show stint to drop in on Chelsea at an inopportune moment. Namely, he interrupted her in the shower!

The naked conversation that ensued included Conan's complaints about Chelsea stealing his studio (and his back massager), Chelsea trying to goad Conan into hitting her, and a slap fight the likes of which you've (hopefully) never seen before.

Check out the clip above, and be sure to tune in for all-new episodes of Chelsea Lately on weeknights at 11/10c, only on E!

PHOTOS: See the latest behind the scenes pics from the Chelsea Lately staff!

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