Even grown men can't resist the wiles of One Direction. Case in point: At the band's taping of 'The Late Show With David Letterman,' Dustin Hoffman tried to smooch Niall Horan!

The Daily Mail reports that the veteran actor was sharing a couch with the group for their episode (airing tonight, Dec. 7) and he couldn't contain himself. He lurched onto an unsuspecting Horan, giving him a playful "snog" on the lips. Horan's bandmates couldn't contain themselves, and we don't blame them -- it was probably funnier than any Top 10 list in a while.

Aside from getting mauled by 75-year-old men, the band chatted up Letterman and performed their ballad 'Little Things.'

The band were all too eager to interact with their beloved Directioners who waited outside the theater -- except a certain Harry Styles, who raced ahead of Horan, Liam Payne, Zayn Malik and Louis Tomlinson to avoid them. Sounds like Taylor Swift has him on a short leash -- or maybe he was avoiding more incidents with cops.

Watch One Direction Outside of 'The Late Show' Studio