Jennifer Lopez wore a yellow bikini two weeks ago while in Brazil with boyfriend Casper Smart. J Lo and Casper were in Rio to check out Carnival. The South American beer company Brahma brought Jennifer and Casper down for the celebrations, but she managed to break from the partying for a yacht day with Casper and friends. Jennifer and Casper have since returned to LA, where she's been busy. She attended last weekend's Oscars, presenting onstage with Cameron Diaz and reuniting with Casper at the Vanity Fair afterparty. J Lo's also been occupied with American Idol. She and fellow judges Randy Jackson and Steven Tyler helped narrow the field down to 13 remaining contestants last week.