Steve GranitzGetty Images Jennifer Lopez, 52, revealed the “secret sauce” for her glowing skin in a new Instagram video. Showing off a natural complexion, the Marry Me star said that the Jlo Glow Serum from her beauty line helps “rejuvenate” her skin after long days of filming. “I have to tell you guys, this is no bullsh*t,” Lopez said. With her sculpted figure and radiant complexion, Jennifer Lopez has pretty much defied all signs of aging—and the actress is finally revealing the “secret sauce” to her youthful glow at 52. In a new Instagram video, Lopez said that the Jlo Glow Serum from her Jlo Beauty Line helps revive her…