The polka-dot-wearing actress makes a cheerful arrival to the Late Show with David Letterman. Plus: Blake Lively, Gavin & Gwen, Nick Jonas and more

THE EX FACTOR

Salma Hayek returns to ex-fiancé Francois-Henri Pinault's side – again! – Tuesday during the Balenciaga fashion show Tuesday in Paris (Pinault owns the fashion house). "[They were] very friendly together, looking happy," described one attendee of the pair, who also hung out recently in Los Angeles.