Kevin Federline helped his son Sean Preston into the car yesterday following the youngster's latest Little League game in LA. Britney Spears was on hand for the matchup as well, and she was spotted laying low in her SUV on the way home with her boyfriend Jason Trawick. Sean Preston will soon welcome a brand new half-sister, since Kevin and his lady friend, Victoria Prince, are expecting a girl they plan to name Jordan. Kevin and Victoria are extremely excited about the special delivery, and even posed for some adorable bump photos last week. Britney, meanwhile, recently unleashed her latest baby, her record Femme Fatale, into the world. She's also just put out a remix of the song "S&M" with its creator, Rihanna. It's another hip-hop star, however, who is replacing Enrique Iglesias as Britney's parter on her upcoming North American tour — Nicki Minaj just signed on as her opening act, and the singers will announce the on-sale date for tickets tomorrow.