RiRi’s outfit of choice has caused more pregnancy rumours to fly. Alexa, play “Fashion Killa” by A$AP Rocky. Over the weekend, Rihanna and her rapper boyfriend stepped out on the town for a New York City date night, looking as stylish as ever. As InStyle reports, the “Umbrella” singer’s look consisted of an oversized jersey that reached down to the tops of her thighs, a …