Star Tracks - Monday, Nov. 8, 2004

L.A. natives Ashley (left) and Mary-Kate Olsen are true New Yorkers now: The sisters cheer on the Knicks on Saturday at Madison Square Garden as they battle the Boston Celtics. Unfortunately, their twin power wasn't enough to help the Knicks win – they lost 107-73.

Meanwhile, O.C. star Mischa Barton and boyfriend Brandon Davis snuggle courtside Sunday at the Los Angeles Lakers-Atlanta Hawks game at L.A.'s Staples Center. The couple watched their home team shoot and score to victory, 106-90.

While out with husband Kevin Federline (not pictured) on Sunday, Britney Spears pens another "letter of truth" – this one to shoppers in West Hollywood. The singer, who also recently posted a note on her Web site saying she's focusing on "myself, my husband, Kevin, and starting a family," left her mark on a store's message board.

Shania Twain returns to her native Canada on Wednesday to promote her Greatest Hits CD on the Canada AM talk show in Toronto. The album hits stores Nov. 9.

Jennifer Aniston, who's been busy filming the romantic comedy Rumor Has It, takes time off to meet a friend for lunch at Beverly Hills hotel Raffles l'ermitage on Wednesday.

Ben Affleck makes a run for it Thursday on the Vancouver set of his movie Man About Town, about a talent agent whose life is turned upside down when he finds out his wife is cheating on him.

Ellen DeGeneres perfects her New York City vendor's smile Friday as she tries to impress The Donald with her hot-dog-slinging skills during an Apprentice-style task for her talk show. She'll go head-to-head with Trump in his boardroom later this month.

Boxers or briefs? Forget it. Jerry O'Connell sports a more unexpected undergarment Thursday on the set of Last Call with Carson Daly. The actor wore the diapers for a skit on the show airing Nov. 11.