SALT LAKE CITY — Teenage kidnapping survivor Elizabeth Smart has given birth to her third child.

Smart announced the birth on her Instagram account on Monday with a picture of her holding new daughter Olivia as husband Matthew Gilmour looks on.

In her post, Smart says "So happy to welcome Olivia to our family!"

In 2002, Smart was kidnapped at age 14 from her Salt Lake City bedroom by street preacher Brian David Mitchell and held captive for nine months. Mitchell was sentenced to life in prison for kidnapping and raping Smart.

Mitchell's wife, Wanda Barzee, was also in prison but was unexpectedly released in September.

Smart, now 31, has become a child safety advocate. She spoke out against Barzee's release but said she won't let it stop her from living her life.