Via Steve Donnelly:

On the way back from NYC… Auditioning for a reality tv show was a long, long process. I’ve never filled out so much paperwork in my life! Oh yeah. And David Archuleta joined the group at the auditions….

According to Snarky Archies, it looks like he was at auditions for NBC’s “The Sing Off“:

THE SING OFF

The ultimate A Cappella Competition

Seeking a cappella groups for new prime time competition show! Each week, a cappella groups from around the country will compete for a Sony Recording Contract and national acclaim! Groups will rehearse and sing the world’s most popular songs, arranged and performed like you’ve never heard them…no lip-synching, no back-up bands, no safety net. They will compete in front of the show’s panel of professional experts. One group will be eliminated each episode and America will decide in our live finale who will be the nation’s best a cappella group and will walk away with the ultimate prize.

I think David is just guest-starring for the show.