Darren Criss, who plays Blaine Anderson on the Fox hit "Glee," will perform for President Obama at the LGBT Leadership Council fundraising gala in Beverly Hills on Wednesday.
Criss is replacing "So What" singer Pink, who was forced to bow out of the event due to illness.
Criss revealed his participation via his Twitter account Tuesday, writing, "So bummed I'll have to miss my dental appointment to sing for The US President Wed night. thanx @Pink for messin that up!!"
For the irony-impaired, Criss added, "But in all seriousness @Pink- what an honor!"
In addition to his acting duties, Criss has launched a musical career, releasing an independent EP, "Human," in 2010. Criss is signed with Sony Music Entertainment, with an eye toward releasing a full-length studio album.
Obama became the first U.S. president to come out in favor of marriage equality in May, telling ABC News' Robin Roberts, "I’ve just concluded that for me personally it is important for me to go ahead and affirm that I think same sex couples should be able to get married."