Katy Perry has not been shy about sharing her political views with fans. In fact, the “Teenage Dream” singer is so enthusiastic about encouraging young people to vote that she literally wore her ballot on her sleeve at an Obama rally on Wednesday night.

The 28-year-old pop star showed up at an Obama/Biden rally in Las Vegas, Nev. wearing a skin-tight latex white mini-dress fashioned after an election ballot. Across Perry’s chest were printed the words, “President of the United States” in large capital letters, and underneath were check boxes for Obama and Romney, the former of which had been filled in.

Perry took the stage at a park in downtown Las Vegas just as Air Force One touched down at the nearby McCarran International Airport. Kicking off her free, 30-minute-long set in front of a screaming crowd of over 10,000 people, Perry opened with a cover of Al Green’s “Let’s Stay Together.” She then segued into some of her own hits, playing five songs including her 2010 hit “Teenage Dream,” before closing with an enthusiastic rendition of “Firework,” reported the AP.

The performance marked the second time that Perry has performed at an Obama rally; her first was at an event in Los Angeles on Oct. 8. For that show, Perry debuted an Obama inspired manicure, which she documented on her Twitter account.

But the event was also a milestone for Perry for another reason, as Perry celebrated her 28th birthday at midnight. “So tonight was a great night! The PRESIDENT gave grandma and I unforgettable shout outs & now I am officially 28! Best. birthday. Ever,” she tweeted after the rally. Perry’s 91-year-old grandmother was also reportedly in attendance.

Perry also used her platform to urge the crowd to vote early. "Don't wait. Go tomorrow," she said. "How many of you are 18 here? It's going to be your first time, right?"

Perry also recently performed at Comedy Central’s “Night of Too Many Stars,” a fundraiser for autism, during which she performed a duet of “Firework” with Jodi DiPiazza, a young girl with autism. Perry tweeted after the event, “I will never forget last night. It was the most important moment thus far of what I do.”