Justin Timberlake, Jessica Biel Moving to New York City

The two were photographed checking out their new Manhattan apartment on Monday.

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"The apartment is great. He's loving it!" the singer's mother, Lynn Harless, told Us of his NYC pad with Biel, at his William Rast fashion show on Monday.

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Biel -- who was seated next to Emile Hirsch -- sat front row at the show, where she clapped often for her beau.

Harless told Us she is equally proud of her son.

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"I've always been a music person first and foremost, but I think we've all become serial entrepreneurs," she said of her son's idea to start a clothing line with pal Trace Ayala. "We are open to whatever comes along."

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