1. Britney Spears was welcomed to Las Vegas.
4. Celine Dion played a ukulele.
6. Mariah Carey officially christened the holiday season.
7. Katy Perry was named a Unicef ambassador.
10. Amy Poehler and Rashida Jones sat at a table.
11. Andrew Garfield wore dad jeans.
12. David Beckham & Harry Styles posed for this photo.
13. Ashton Kutcher and Mila Kunis wore matching jerseys.
14. Cameron Diaz filmed “Annie.”
15. Jennifer Garner and her son Samuel met a horse.
17. Adrien Grenier went for a run.
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