Down To His Undies: UFC Fighter Conor McGregor Poses In Briefs

Conor McGregor stripped down to his undies to hock a teeth whitening system, on Instragram. 

But forget about that box, get a load of that bulge!


@Hismileteeth! I don't even got to smile, but I've got a million reasons to. #Ad #HiSmile

A post shared by Conor McGregor Official (@thenotoriousmma) on

Last year, Conor went nude for ESPN's body issue.

And earlier this year, he got naked to ride bareback...