Pop star Britney Spears is engaged to her boyfriend Jason Trawick, celebrity media outlets reported on Friday after the singer posted a message on Twitter about receiving “the one gift” for which she has longed. Television show “Access Hollywood” said host Billy Bush reached Trawick by text message, and the groom-to-be confirmed the news. “Yes, we are engaged,” the show quoted Trawick as telling Bush. Celebrity news magazine Us Weekly also reported the engagement, citing an unnamed source, saying Trawick popped the question at a private dinner Thursday on his 40th birthday, presenting the singer with a three-carat round stone and pave diamond ring. Website TMZ said the pair would be celebrating their engagement Friday night in Las Vegas. __