Oscar- and Grammy-winning pop star (and Weight Watchers spokeswoman) Jennifer Hudson will headline the Boston Pops Fireworks Spectacular on the Esplanade this year, according to the Boston Symphony Orchestra. She’ll have some help from Boston’s own Michael Chiklis, who’ll host the night. Actor Chiklis emceed the gig last year and even sang a song of his own. The actor’s new series, “Vegas,” which costars Dennis Quaid, was just picked up by CBS. Last year’s Esplanade headliner was Martina McBride.