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(CNN) —  

Hillary Clinton celebrated her 68th birthday Monday, receiving shout-outs on social media from supporters, celebrities and politicians. Her campaign also turned the day into a political play, creating a birthday card for Clinton fans to sign.

Clinton kicked off her birthday blowout Saturday with “Hillary for America” rally in Des Moines, Iowa. Pop star Katy Perry, who’s birthday is the day before Clinton’s, performed. Perry is a big fan of the Democratic candidate, and Clinton frequently uses Perry’s songs at campaign events.

RELATED: Inside the Clinton campaign’s plan to keep the momentum going

Perry also took over Clinton’s Instagram account the day of the event, sharing a picture of the “POTUS” necklace she gave the former secretary of state.

“My birthday gift to fellow Scorpio, Hillary, says it all. -Katy”

Clinton’s husband, former President Bill Clinton, and others wished her a happy birthday on Twitter, some using #HBDHRC.