The week in art

He's convincing as a cannibalistic serial killer, yes. But an artist? Judge for yourself in Canada where an exhibition of paintings by the actor Anthony Hopkins is opening at the Harbour Gallery, Ontario on 26 May. 'His work has a magnetism that draws you in,' says the gallery's director Photograph: Harbour gallery/PR

A major retrospective of New York photographer Diane Arbus has opened in Cardiff. The exhibition is the second in the Artist Rooms events, which include works by Andy Warhol and Damien Hirst. The show will be on at the National Museum Wales from 9 May to 31 August. Seen here is Arbus's A Young Man in Curlers at Home on West 20th Street, NYC Photograph: 1971 The Estate of Diane Arbus, LLC/PR

Lithuania's art industry is opening the door to the global art market with a contemporary art fair in Vilnius. ArtVilnius 2009 came into being after this summer's Moscow Art Fair was cancelled due to financial difficulty. It will host works by artists from the former Soviet bloc, such as this painting by Andrej Wasilewski, as well as from countries as far away as Argentina and Canada Photograph: Piekary gallery/PR

Over to Oxford, where the Pitt Rivers Museum has been revamped and reopened to resemble a mine-like cavern. It's full of anthropological treasures and oddities including these dolls, as pictured, monkey skulls and a witch in a bottle Photograph: Martin Argles/Guardian

Jeff Koons may be one of the world's most expensive artists – his 7ft egg has just sold at Sotheby's for £3.5m – but it's only now that the American artist is having his first solo show in Britain. The Serpentine Gallery, London, has announced that it will exhibit Koons's Popeye series, exploring consumerism, childhood and sexuality Photograph: PR

His father hogged the headlines this week with his architectural spats and musings, but Prince William made his own first official engagement in the tricky world of contemporary art. The Prince officially opened the Whitechapel Gallery this week, where he joked to the audience that he was in fact Banksy Photograph: Andrew Winning/AP

A Tintin auction in Belgium struck gold with the sale of items connected to the character's creator, Herge. The most expensive purchase was £280,000, for a hand-drawn page of The Castafiore Emerald Photograph: PR