Colin Farrell has become the second actor to swear live on U.S. TV within the space of three days when he accidentally let slip the “F” word in a morning interview.

Farrell was talking to CNN host Brooke Anderson at the Sundance Film Festival in Utah on Friday when he forgot himself - just days after Diane Keaton did the same thing.

When explaining why director Woody Allen let him keep his Irish accent while starring as a hitman in new London movie Cassandra's Dream, Farrell said, "F--- that, he's Irish!"

Then, realizing his use of foul language probably wouldn't sit well with young viewers across America, clumsy Farrell exclaimed, "Oh s--t!"

On Tuesday, Keaton shocked broadcaster Diane Sawyer when she complimented the "Good Morning America" host's lips by saying, "I wish I had lips like that; then I wouldn't have to work on my f---ing personality."

(This news article provided by World Entertainment News Network)