Jennifer Aniston, 45, stuns in transparent black gown revealing unexpected surprise at Cake premiere alongside Justin Theroux

Karen Mizoguchi reported for MailOnline that Jennifer Aniston, known for her conservative fashion choices, surprised everyone at the Toronto Film Festival premiere of her movie Cake by wearing a daring sheer black dress without a bra. Despite the revealing outfit, the 45-year-old actress looked unfazed and happy while attending the after party with her fiancé Justin Theroux.

Braless: The Life Of Crime star wore a sleeveless black dress and forgot to wear a bra as she displayed her fit arms and tan gams

It seems Jennifer Aniston might not have expected this: she arrived at the premiere of her latest film Cake at the Toronto Film Festival wearing a see-through dress.

Happy couple: Jennifer Aniston and her fiance Justin Theroux attend the premiere of her latest movie Cake during the Toronto International Film Festival together on Monday

Blissful pair: The 45-year-old stunner was seen standing next to her fiancé Justin Theroux at the post-event celebration. Aniston, who also worked as an executive producer for Cake, styled her blonde hair loose around her shoulders and paired it with elegant black high heels. She appeared happy as she posed for a photo with her Cake co-star Sam Worthington.

Sheer delight: The Along Came Polly star was showing off a very fit body at the event, most likely the result of frequent yoga sessions

Pure joy: The Along Came Polly actress looked stunning, flaunting her incredibly toned figure at the gathering, possibly due to her regular practice of yoga.

Looking happy: Jennifer Aniston showed her beaming smile and toned figure in a slimming little black dress while leaving a TIFF event in Toronto, Canada on Monday

Aniston appeared delighted as she flaunted her radiant grin and fit physique in a chic little black dress during the photo shoot.

Matching co-stars: The actress cozied up to her Cake co-star Sam Worthington while at a press gala for their latest movie

The actress was seen getting cozy with her co-star from Cake, Sam Worthington, at a press event for their new film.

Where's Jen? Also at the event was Jennifer's fiance Justin Theroux

He appears to be in high spirits: Justin Theroux seems to be one happy guy.

A-list friends: Also at the event was actress Anna Kendrick

Top-tier pals: Actress Anna Kendrick was in attendance at the event as well. Earlier in the day, she was seen exiting the Holt Renfrew stores in a matching black outfit. It seemed like she was in good spirits, holding a vibrant pink bag of treats as she left the upscale fashion hub.

Aniston, who served as executive producer for Cake, wore her blonde locks around her shoulders

LBD: Aniston, who was credited as the executive producer of Cake, sported her golden hair cascading around her shoulders.

Saying hello to her fans: Jennifer waved to onlookers as she stood with Sam outside the Elgin Theatre

Greeting her supporters: Jennifer smiled and waved at the crowd as she stood alongside Sam in front of the Elgin Theatre.

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Stunning in black: Jennifer appeared at a photo call for the world premiere of Cake

Stunning in black: Jennifer appeared at a photo call for the world premiere of Cake

Jennifer looked absolutely gorgeous in a stunning black outfit as she showed up for a photo call at the worldwide debut of Cake.

Unintentional? The star showed off her chest in a sheer black dress, making it obvious she chose to go bra free for the event

Did she do it on purpose? The celebrity confidently rocked a sheer black dress, flaunting her bare chest and opting to forgo a bra for the occasion.

On the go: The 45-year-old actress wore her blonde locks around her shoulders and completed her simple look with maroon high heels

Before attending the premiere, the Wanderlust actress decided to change into a new outfit when she made a quick stop at Holt Renfrew.

Beaming smile: Aniston looked to be in good spirits as she walked out of the stylish venue with her new items in her pink bag

Grinning from ear to ear, Aniston appeared to be quite happy as she exited the trendy location with her latest purchases tucked away in her pink bag. Just the day before, on Sunday, Jennifer spent some quality time with her hairstylist and close buddy, Chris McMillan. She got her iconic locks styled into a fashionable braided updo and even snapped a selfie with McMillan once her makeover was complete. Sharing the photos of Jennifer, he captioned them with various hashtags like My Girl, Can’t Live Without, and Updo Love.

A couple in love: Jennifer and Justin gave wide grins for the camera as they snuggled up at the cocktail reception following the premiere

Jennifer and Justin, a pair deeply in love, flashed bright smiles for the camera while embracing each other at the cocktail reception that followed the movie premiere.

Only eyes for you: The pair looked at each other lovingly, seemingly lost in their own world

Lost in a world of their own, the couple shared a tender gaze, completely captivated by each other.

Lovely ladies: Jennifer and Anna posed together, both showing off their slender figures in their cocktail dresses

Two beautiful women, Jennifer and Anna, stood side by side, flaunting their trim silhouettes in elegant cocktail dresses.

Stylish selfie: The Cake star took a selfie with her hair stylist and good friend Chris McMillan on Sunday

Trendy self-portrait: The actress from The Cake movie snapped a photo with her trusted hairstylist and close buddy, Chris McMillan, over the weekend.

Chic updo: McMillan styled Jennifer's hair in a chic braided updo for a press event

Stylist McMillan created a sophisticated braided updo for Jennifer at a recent press event. Following her appearance on the Stand Up To Cancer telecast, the Cake actress jetted off to Canada. Alongside a lineup of A-listers like Robert Downey Jr., Pierce Brosnan, Halle Berry, and Will Ferrell, Jennifer helped raise a remarkable $109 million in support of cancer research. Together, they urged viewers to contribute towards finding new treatments for different forms of cancer.

Stand Up To Cancer: The actress traveled to Canada after appearing at the Stand Up To Cancer telecast on Friday and joined a slew of Hollywood celebrities as they raised $109m to benefit the fight against cancer

Actress heads to Canada after participating in the Stand Up To Cancer event, where she joined numerous Hollywood stars to raise an impressive $109 million towards cancer research and support.

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