Michelle Trachtenberg, a former child star who appeared in the 1996 "Harriet the Spy" hit movie and went on to co-star in two buzzy millennial-era TV shows — "Buffy the Vampire Slayer" and "Gossip Girl" — has died.

Michelle Trachtenberg, the actress who rose to fame as a child star with films like “Harriet the Spy” and went on to have memorable roles on TV shows including “Gossip Girl,” has died, according to an NYPD source.

Actress Michelle Trachtenberg, known for "Buffy" and "Gossip Girl," died at 39 in NYC under non-suspicious circumstances. Her recent liver transplant was cited as a natural cause of death.