Radcliffe was shooting a scene for Judd Apatow's latest directorial effort, Trainwreck. The comedy was written by Amy Schumer and also stars Tilda Swinton, Brie Larson, Bill Hader and Marisa Tomei.

"We don't know what Daniel Radcliffe is doing with @JuddApatow, but we like it," Apatow retweeted a sentiment posted by Pop Sugar.

A Radcliffe fan site posted more pics of the erstwhile Harry Potter star shooting his apparent cameo, though the director played coy when asked about it on Twitter, writing, "Not true! He was just walking his dogs."

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