By Michael Ausiello
Updated June 26, 2009 at 12:00 PM EDT

Mark Pellegrino’s career is on fire. Literally.

Sources confirm to me exclusively that the actor — who was unmasked as Lost‘s enigmatic Jacob at the end of last season — is joining the cast of Supernatural as none other than the Prince of Darkness himself, Lucifer.

Lucifer was released from hell in Supe‘s season finale last month, although we never caught a glimpse of the little devil’s face. All of that will change when Pellegrino (also known for his role as Rita’s rather satanic ex on Dexter) debuts in the show’s Sept. 10 season premiere.

So, does this mean we’ve seen the last of Jacob on Lost? An ABC rep couldn’t be reached for comment, but here’s a potential clue: Pellegrino isn’t joining Supernatural as a full-time series regular; his status is listed as recurring. You do the math.

Thoughts on this red-hot piece of casting? Sound off below!