Melissa Joan Hart feels “really guilty” about taking Britney Spears out clubbing when she was underage. The 48-year-old actress was playing the title role on the sitcom ‘Sabrina, the Teenage Witch’ when the then-17-year-old Britney landed a guest spot on the show at the start of her pop career in 1999 and the pair went out clubbing together but Melissa confessed that she “should have known better” than to encourage such behaviour. She told ‘Entertainment Tonight’: “Britney and I got to do a lot of press together. And we had a lot of fun together during this time. I saw that she was just surrou…