Taylor Swift, Scarlett Johansson and Sandra Bullock lead best dressed stars at TIFF

Actress Jennifer Aniston attends the premiere for "Life of Crime" on day 10 of the 2013 Toronto International Film Festival at the Roy Thomson Hall on Saturday, Sept. 14, 2013 in Toronto. (Photo by Arthur Mola/Invision/AP)

Scarlett Johansson looked amazing in a Saint Laurent LBD.

Olivia Wilde showed off her figure in bodycon Roland Mouret.

Jennifer Garner looked lovely in lace Dolce and Gabbana.

Elizabeth Olsen went for edgy Proenza Schouler and ankle boots.

Olivia Wilde brightened up the red carpet in yellow Valentino.

Taylor Swift opted for cut-out Calvin Klein Collection and strappy gold heels.

Marion Cotillard wore a daring see-through lace Christian Dior gown.

Jessica Chastain's turquoise Atelier Versace gown complemented her auburn locks.

Thandie Newton showed off her baby bump in monochrome Stella McCartney.

Sandra Bullock wowed in colour-block Narciso Rodriguez.

Kate Winslet flaunted her bump in navy Jenny Packham.

Keira Knightley looked pretty in printed Mary Katrantzou.

Julia Roberts looked show-stopping in red lace Dolce and Gabbana.

Mila Kunis wore a plunging white Burberry Prorsum dress.

Saoirse Ronan teamed her Mary Katrantzou frock with plum lips.

Nicole Kidman worked the masculine trend in an Altuzarra suit.

Marion Cotillard looked sophisticated in monochrome Christian Dior Couture.

ScarJo wowed in polka-dot Vivienne Westwood and peep toe heels.

Reese Witherspoon showed off her post-baby body in low-cut Jason Wu and green pointed heels.

Dakota Fanning looked camera ready - or not - in off-the-shoulder Valentino.