Are there any J2 AU fics in which Jensen meets and dates Jared without realizing that Jared is an important/famous person? Something along the line of Nosce te ipsum by rei_c.
audrarose's brilliant Open Mike Night at the Fremont (http://audrarose.livejournal.com/132263.html) is an AU that has Jensen not recognising Jared as a famous artist. It happens before they start dating, though.