Britney Spears and Kevin Federline's sons, Sean Preston and Jayden James, have started going by their mother's world-famous last name, Us Weekly can exclusively confirm. However, Preston, 20, and Jayden, 19, have not made any legal changes to their names. Us Weekly has reached out to reps for Spears and Federline for comment. The news comes after Spears, 44, shared Instagram photos with both of her sons for the first time in years on Sunday, March 29. The trio posed together aboard a boat, with Spears standing in the middle as Preston and Jayden towered over the 5-foot-4 pop star.