Oscar and Grammy-Award winner Jennifer Hudson was spotted Thursday night at the Waldorf Astoria Chicago (11 E. Walton) giving a surprise performance for Michigan Avenue Magazine and Art Van Furniture to benefit the Julian D. King Gift Foundation. Jennifer, alongside her sister, Julia Hudson, accepted a $15,000 donation from Michigan Avenue’s President and Publisher Dan Uslan and Art Van Furniture’s Chairman and Founder Art Van Elslander on behalf of the foundation. Hudson’s finale brought the crowd to their feet with a Whitney Houston medley of “I’m Every Woman,” “How Will I Know” and “I Wanna Dance with Somebody” as she danced with guests throughout the intimate, lounge-like setting fashioned within the hotel.