The 2007 Toronto Party Circuit

The circus came to town when Sienna Miller hosted a party at Canadian department store Holt Renfrew to introduce fashion fans north of the border to her new Twenty8Twelve line. Stilt-walkers and fire-jugglers lined the red carpet entrance and inside it was an equally wild scene. Behind the plush red velvet curtains of the VIP room, ringmaster Miller played host to celebrity friends like Sean Penn, Maggie Grace and Liv Tyler. Emile Hirsch eyed the super-sweet buffet table offering sugary delights like mini ice cream cones and oversize lollipops. "We love the Oliver Twist era, so this circus theme ties in very nicely," said Sienna?s sister and co-designer, Savannah Miller. "Sienna and I are inspired by Dickensian London and all that kind of backstreet weirdness that went on at the time."

"I was in the cab like this," said Emily Mortimer, taking on the pose of a stiff robot to signify how difficult it was to move around in her glamorous Vivienne Westwood dress at the In Style party for Lars and the Real Girl, held at Brassai bistro. Asked to give her own review of the finished film, the humble actress played it coy. "I've already seen it once so I'm not going to do the neurotic thing," Mortimer said of the flick, about a young man who forms a romantic relationship with a synthetic doll.

"I will do a private concert in your house!" offered Wyclef Jean to the crowd of bidders at Matt Damon's One X One event, held at Toronto?s glamorous new opera house. Jean then showed off what the winner could expect when he backed up Shakira?s hip-shaking performance, which got Petra Nemcova into the spirit of giving. "I will cook!" the model volunteered. "I will bake strudel."

Before the premiere of their film, The Jane Austen Book Club, co-stars Maggie Grace and Maria Bello attended the Sony Pictures Classics party at Toronto hot spot Michelle's Brasserie. "We all bonded on such a huge level," said Bello of filming the romantic drama, which will hit US screens in November.

After hitting the launch party for Sienna Miller's new Twenty8Twelve line, Hilary Duff provided the entertainment when she performed at MuchMusic's Star! Schmooze at department store Holt Renfrew. The pop star-who recently wrapped filming on a new movie with John Cusack-hit the corner of Queen and John Streets for an outdoor concert attended by thousands of fans.