Actress Sienna Miller was shocked during an interview with talk show host David Letterman when he played an embarrassing clip of her cursing on live TV.

Miller was on the show 'Today' and was filming a live promotional spot when she inadvertently let a bad word slip, said contactmusic.com.

Miller said: 'I heard about it. I just got informed. I'm horrified. I had no idea. It's that thing where you're sitting there and you feel like a complete lemon. It's not three seconds, it's 10 of you just sitting there (smiling) and you don't know what to do! I heard that I swore...which does sound like me, I have to admit.'