OH, no he didn't! Britney Spears' hubby, Kevin Federline, skipped the first birthday party of son Kaleb, one of his two kids with ex-gal pal Shar Jackson. A spokeswoman for Jackson claims that little Kaleb's birthday last Wednesday "came and went without a visit, present or phone call from Kevin or Britney." Jackson, who has previously accused Federline of stiffing her on child-support payments, celebrated Kaleb's big day with her and Federline's 2-year-old daugher, Kori, and other family members, though her boyfriend, Quentin Tarantino, was not present. Federline's publicist did not return calls for comment.