TMZ broke the story, Britney and Sam will be getting married on Thursday in Los Angeles. Spears’s brother Bryan is expected to be present … but mom, dad, Jamie Lynn’s sister and Brit’s two boys will not be there. Kevin Federline’s lawyer, Mark Vincent Kaplan, tells us that 16-year-old Sean Preston and 15-year-old Jayden James will not go. He adds: “Although the boys will not be attending, Kevin and the boys are happy for Britney and wish her and Sam all the best for later.” Sources tell us that about 100 people are expected to be there to watch Sam and Britney say their “I dos” at a stage ceremony. Play video content Britney posted a video of Sam Wednesday with a glass of champagne and freshly decorated nails … probably ready for the big day. Crews continue to set up the event before the guests arrive and while Brit and Sam prepare for what is to follow.