TMZSports.com
Paul Pierce has finally clocked in for his day job at the Fox Studio Lot ... and he's adamant he walked the full 20 miles to get there.
The NBA legend told TMZ Sports as he was finishing up his trek that he paid off his bet to his "Speak" colleagues in full -- using no means of transportation other than his feet to get him from The Valley to West Los Angeles on Thursday.
He also said he doesn't regret making the wager -- which, of course, he placed on Wednesday afternoon when he believed his former Celtics team would beat the Knicks in Game 2 of their playoff series at TD Garden.