The stars were out in full force at the Tiffany & Co. debut of The Blue Book 2014 in New York City last night. From Kate Boswell to Jessica Biel to Katie Holmes, celebrities graced the red carpet with style. We loved Jessica Biel’s long black gown with plunging neckline and Kate Bosworth’s pink, princess-like slip dress.. From so many outstanding dresses it was hard to narrow down to…