Betty White -- the five-time Emmy Award-winning actress, the woman Oprah Winfrey called a “national treasure,”

and the Guinness World Record holder for “Longest TV Career for an Entertainer (Female)”

-- has died Friday morning at her home, ET has confirmed. She was 99 years old.  No other details are available at this moment.

Her death comes ahead of her 100th birthday on Jan. 17, which will be celebrated on TV with the once-in-a-lifetime movie event, Betty White: 100 Years Young -- A Birthday Celebration.

The Mary Tyler Moore Show, set in the 1970s, starred its namesake, naturally, who depicted the cheerful Mary Richards, a single, career-oriented woman who worked for WJM, a fictitious Minneapolis TV station.

In 1985, White joined The Golden Girls, a show about four women, single and older, roommates bound by friendship. She played Rose -- sweet, simple and sincere -- an inverted Sue Ann.

She was famously appointed to host Saturday Night Live in 2010 -- the oldest person to do so in SNL history -- after hundreds of thousands of her fans demanded it in a social media campaign.

After seven decades on TV, the Daytime Emmys honored White with a Lifetime Achievement Award in 2015.

Betty White will be remembered. She will stay on the air and in print.