In preparation for the summer season, Jennifer Aniston has opted for a tube top as she shops at ‘Fred Leighton Rare Collectible Jewels’ on Madison Avenue in New York City. She later headed to the Metropolitan Museum of Art. While Katie Holmes may have the pegged-jeans look, Jen is rocking the baggy-jeans style. Meanwhile, her ex-boyfriend John Mayer was spotted at his favorite Japanese restaurant, Nobu Next Door, on Thursday.