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Justin Timberlake, Jessica Biel

PacificCoastNews.com

It was a busy weekend for Justin Timberlake!

The singer traveled solo to Louisville, Ky., Saturday to catch the Kentucky Derby—reportedly trying to go incognito, refusing all photo ops and interviews.

(But even his security team couldn't stop some people from snapping pics of him!)

It was a whirlwind trip. By Sunday, J.T. was back in the Big Apple, spending quality time with girlfriend Jessica Biel.

The couple were photographed strolling hand in hand through Tribeca in the afternoon, before catching a Broadway show that night.

J.T. and Jess saw In the Heights and looked perfectly happy together says our source. After giving a standing ovation, they hung with the cast (including Corbin Bleu).

"They popped backstage after the show to say hi to the cast and to congratulate them and tell them how much they loved the show," the insider tells E! News. "They said they had a great time."

Guess his working with ex Cameron Diaz really hasn't affected this twosome!

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See more stars out and about in Party Pics: New York!