A final message from late US actress Betty White has been posted on her official Instagram, thanking fans for the “outpouring of love” following her death.

The special video message was originally recorded for fans attending a film screening of a documentary to mark the TV veteran’s 100th birthday.

The post said that White wanted to use her landmark birthday to celebrate her fans, and that she never took their support for granted.

The award-winning Golden Girls actress died on New Year’s Eve aged 99, less than a month before her landmark birthday on January 17.

“I just want to thank you for your love and support over the years, thank you so much, and stick around,” White says in the video, wearing a lime green top and white trousers with an electric green blazer.

The video caption read: “As we continue to see number coming in from all over the world — it’s just absolutely amazing how much money all of you raised for the animals through #thebettywhitechallenge.

“She could never have imagined such an outpouring of love and would have be so grateful to everyone.

“When we recorded her special message to fans who attended the movie, we also recorded one that we had planned to put on social media on her birthday.

“She was using the occasion of her 100th birthday to celebrate YOU – her fans.

Philanthropy Betty White Challenge
Outside of her acting career White was well known for her love of animals and activism (Chris Pizzello/AP)

“She knew how lucky she was; she felt the love, and she never took it for granted.

“I think it’s appropriate to post today as a thank from Betty and the animals.”

Outside of her acting career, White was well known for her love of animals and activism.

The Betty White Challenge encouraged people to donate five dollars to any local or national animal shelter in the actress’ name before or on her birthday.

White appeared in other hit US sitcoms including Hot In Cleveland, The Mary Tyler Moore Show, The Betty White Show and Life With Elizabeth during a career spanning more than 80 years.