Before hitting up JT's William Rast fashion show, Justin Timberlake and Jessica Biel were spotted checking out the new Manhattan apartment that they'll be sharing.

"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.

Now that Jess and Justin are playing house, the next logical step would be to get engaged. Anyone want to take bets on when the "SexyBack" singer will pop the question?