(CNN) -- Former First Lady Nancy Reagan lost her balance and fell Tuesday night as she arrived at the Ronald Reagan Presidential Library in California to hear U.S. Sen. Marco Rubio (R-Florida) speak.
Rubio caught Reagan, 90, before she hit the ground and a library spokeswoman said she is fine.
"She's just fine. Our aisles were crowded and she tripped on a stanchion, but recovered quickly, and we started the program on time," said Melissa Giller, a spokeswoman from the library.
Video footage showed Reagan walking slowly with a cane down an aisle, guided by Rubio. She stalled, said something to Rubio, and then fell.
Rubio caught her as others rushed in to help. Reagan was then slowly escorted to her seat.
Rubio then delivered his speech at the library in Simi Valley, Caliornia.
CNN's Stella Chan contributed to this report.