Prince William treated wife Kate Middleton to a rare date night on Thursday, as the pair went to see ‘Box Office’ record-breaking action film, ‘Avengers Assemble‘. They visited a busy branch of the ‘Odeon‘ chain in the upmarket London district of Kensington, where they tried to blend in with the crowds in low-key clothing. Wills even wore a baseball cap and sunglasses in an effort to divert attention- if anything I imagine that made people stare at him more! Who wears sunglasses to the cinema?! An excited cinema goer tweeted: “OMG watching the ‘Avengers‘ with Kate Middleton and Prince William sitting right next to me!’ Just a few hours later, Wills took Kate to visit his recovering grandfather in hospital, as it is his 91st birthday today.