Despite snaps showing the 24 star enjoying a late night out in London on Wednesday, Kiefer Sutherland was showing no sign of sleep deprivation as he appeared on Jonathan Ross' talk show the following night.
Cutting a dapper figure in an open shirt and black blazer, Kiefer was all smiles as he fired off answers to Jonathan's personal questions.
"I was so cross with myself, it was my way of teaching myself a lesson," Kiefer said, referring to his 48 days in prison following a 2007 drink-driving charge.
"I made a really stupid mistake, I put a lot of things in jeopardy
"It was awful, I was in solitary for a long time, it’s not a place you want to be."
Friday Night With Jonathan Ross airs on Friday at 10.45pm.