Jennifer Aniston, TIFF

J. Countess/WireImage

Whoopsie!

While a little black dress is usually the go-to outfit for practically any occasion, it can sometimes work against you, and unfortunately for Jennifer Aniston such was the case today at the Toronto Film Festival.

The actress stepped on to the red carpet today for the premiere of her upcoming indie drama Cake, and ended up giving fans a little more than they (and probably she) bargained for. Aniston wore an adorable sleeveless black dress with a pleated bottom that looked gorgeous on the celeb's enviable figure (obvs), but Jen apparently decided to leave her bra at home—probably thinking black was a safe bet, but the flash from the cameras proved otherwise.

And in turn, Aniston accidentally flashed some nipple on the red carpet.

Sam Worthington, Jennifer Aniston

Anthony Behar/Sipa USA

The blue-eyed beauty was joined by her fiancé Justin Theroux, and also posed for pictures with co-star Sam Worthington.

Cake tells the story of Claire (Aniston), a woman dealing with chronic pain who develops a relationship with the husband (Worthington) of a woman who kills herself (Anna Kendrick). Aniston is also serving as an executive producer on the movie, being directed by Daniel Barnz with a script from Patrick Tobin.

Chris Messina plays Claire's ex-husband and Felicity Huffman is the leader of the support group. William H. Macy, Marianne Jean-Baptiste, Britt Robertson and Lucy Walters also star.

"Of the zillions of Jennifer Aniston fans, I might be the biggest one of all," Barnz said in a statement released in February when Cake was announced as part of a five-picture deal under the new production shingle Cinelou Films. "I've especially loved her more dramatic performances, and I can't wait to watch her tackle a role that has such a brilliantly funny voice and so much raw pain."

Cake hits theaters next year.

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