Swift catches a case of the giggles during a TV appearance in Toronto. Plus: Gwen & Zuma, Rihanna, Nicole Richie and more

COME ON, VOGUE!

It's a pose-off! Supermodel Heidi Klum engages in a friendly competition Thursday with talk-show host – and CoverGirl! – Ellen DeGeneres, while taping an episode set to air Feb. 2.