"Let's be honest, it was a hard part", Pitt, 56, said.
Some took the move as a green light to "free the nipple" in their own everyday lives: "If Jennifer Aniston doesn't have to wear a bra to the sag awards I don't need to wear one to work", one declared.
One excited fan wrote: 'Hope Brad took that dress off!' with others joking that the photo was taken by Brad Pitt.
Another user, who would clearly like to see the actress back with Brad remarked: "Jennifer, you so handsome".
Jen looked like she thought Brad's acceptance speech was hilarious. Giving the picture of the year already, Brad and Jen were all smiles as they crossed paths at the event.
"No, no!" Aniston responded in disbelief.
Etsy has created a mug with Pitt and Aniston at the annual awards bash on the homeware item, with a love heart as their backdrop.
The former couple where also seen laughing and joking together after Pitt accepted his award for Best Supporting Actor in a Motion Picture for Once Upon A Time ... Jen answered questions about The Morning Show, looking graceful and chic in her floor-length number that really could pass for a wedding dress.
"We've all grown up together, we really have... and it just feels like a really fun night to celebrate and cheer each other on and keep working", Jen said. Jennifer who's been for long known for her quirky character of Rachel in FRIENDS has shared her wish of playing Wonder Woman in the DC comic.
"The reunion you've all been waiting for happened tonight".