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Robert Downey Jr.

Bryan/MRM/NPG.com

Robert Downey Jr. cleans up nicely.

The tuxedo-wearing actor was not photographed Saturday shooting a wedding scene for an upcoming movie. Rather, the Iron Man 3 star was said to be actually attending a pal's nuptials in the role of best man.

While we're used to seeing Downey stylishly scruffy and sometimes even in lederhosen, the penguin suit—accessorized with a lily boutonnière—was sort of a nice, simple change.

And, judging by the pair of dress shoes the guy next to him is holding rather than wearing, perhaps Downey wasn't the only one who doesn't readily say I-do to  traditional fancy footwear.

But at least he was wearing shiny leather sneakers.