Fans Start 'Betty White Challenge,' Encouraging Animal Rights Activism

Fans from all over the nation are gearing up for what would've been Betty White's 100th birthday ... joining in on a challenge encouraging fans to spread the love to animals in need and donate to local orgs.

Brittany Vizcarra from Paw Works joined us on TMZ live to pitch the "Betty White Challenge." As you know, Betty was a fierce animal rights advocate who spent her adult life tirelessly working for animal rights orgs. Brittany says this challenge is about everybody doing more -- just like Betty -- by caring for abandoned and abused animals.

Paw Works is an animal rescue org that places unwanted animals in L.A. shelters into loving homes.

Since the Betty White challenge has taken off on social media, some orgs have seen an uptick in donations ... and with the help of people like Brittany, those donations are bound to pour in all over the U.S., as the 17th approaches.

Brittany says it's super simple to "be more like Betty" ... folks can volunteer, adopt, foster or find any other way to get involved.