Celeb Tracker: The 5 Best Photos of the Week

From a Sandy/Danny Grease reunion to, here's what some of your favorite stars were up to this week!

The movie Grease celebrated its 40th anniversary this week, which is CRAZY. And it was so cool to see stars John Travolta and Olivia Newton-John reunite for the occasion. And 'This Is Us' fans will be happy to see the cast getting prepared to premiere season three of the series on NBC.

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