The One With the Nipples…

Such is the reality for Jennifer Aniston who didn't realize the camera flashes at an event would show more than she bargained for!

The Friends alum was busy promoting her new indie film Cake at the Toronto International Film Festival Monday, Sept. 8. All eyes were on the beauty…and it's not because she looked stunning in her pleated back dress. It's because, um, well…she decided not to wear a bra underneath said pleated black dress.

Annnnd the 45-year-old ended up accidentally flashing the girls:

jennifer aniston

You know who didn't seem to mind? Jen's dashing fiancé, Justin Theroux, who lovingly supported his leading lady at the event:

jennifer aniston

But for the future, Jen, here's a gal who's ready and willing to give you a tip. Click to find out who and see even more wardrobe malfunctions!