One of her colleagues was watching the clip with headphones in – clearly not realising 3.8million people were tuning into the nightly news bulletin.
Raworth was seen introducing the news of England’s cricket series win over South Africa as a woman on the screen drops her trousers to reveal tight pink knickers.
Lying on top of a bare-chested man, the actress then whips off her top followed by her bra to reveal her boobs to the millions of viewers at home.
And it wasn’t long before Twitter was awash with viewers’ complaints.
“Why is there a porn video playing behind one of your news anchors during a report?” one asked.
Another added: “Did I just see boobs on News at Ten?”
A TV source told The Sun: “This has gone down like a lead balloon at the BBC. It is totally unprofessional.
“It beggars belief a sex scene should be played live on air. The employee is on borrowed time when bosses catch up with him.”
The major blooper came just hours after a live BBC News report accidentally caught a festival-goer flashing her boobs.
Andrew Allison, of The Freedom Association, which wants to axe the BBC license fee added she was “surprised” the BBC didn’t have more filters in place to stop such things happening.