A sunny Michelle Williams (in Behnaz Sarafpour) steps out without her constant companions – fiancé Heath Ledger and daughter Matilda (who turns 1 on Oct. 28) – to attend New York City's Whitney Museum gala celebrating the work of Pablo Picasso on Monday. The actress also cohosted an afterparty with attendees including Ivanka Trump, Jimmy Fallon and Saturday Night Live's Andy Samberg.