The singer Beyonce is reportedly pregnant, claims a U.S. newspaper.Pictures of the singer on stage in London appear to show the 31-year-old with an uncharacteristically rounded tummy. And another report claims the singer’s much derided Met Gala look was designed to conceal her growing pregnancy figure.The ‘Grown Woman’ singer - who welcomed her first child, daughter Blue Ivy Carter, into the world in January 2012 - is said to be expecting again with her rapper husband Jay-Z.The New York Post newspaper claims ‘multiple sources’ told them Beyonce, 31, is pregnant following her attendance at the star-studded Met Ball last week, where the star’s rumoured pregnancy was the talk of the night.The pop superstar is said to have ‘carefully’ hidden her baby bump in a high-waisted Givenchy gown, but according to the report, multiple photos have surfaced of Beyonce sporting a growing stomach on her 65-date ‘Mrs. Carter Show’ world tour, which touched down in Dublin, Ireland, on Sunday.