And now the owner of those boobs has revealed her identity - and it is Anna Paquin.
BBC accidentally showed the NSFW footage on a computer screen that was in the background.
Kazinsky, Paquin's co-star in the scene, also got involved: 'Thankfully it's a shot of you and not my tombstone tied donut eating belly'. The nudity left many viewers who spotted it to conclude the employee was watching porn, but Paquin has set the record straight.
"My breasts! So amusing on so many levels", Anna tweeted.
Seven series of True Blood were broadcast between 2008 and 2014, which focused on supernatural events in the small town of Bon Temps, Louisiana.
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"Now that I know what u guys were talking about", she continued after linking to the moment that's gone viral. Thanks for the giggle!
She added: "ya know you've made when. your t***s photo bomb the news at 10".
Anna's fellow True Blood star and real life husband Steven Moyer also joked about the incident on the social media site.
The host had no idea the steamy clip was being watched behind her - and the colleague with his headphones in clearly did not realise 3.8m people could see his screen.
One person on Twitter pointed out that "BBC said it was looking into the matter, saying in a statement it was "establishing the facts".