Paul McCartney's Son Career Support from Ringo Starr

1/30/2012 12:45 PM PST BY TMZ STAFF

Ringo Starr hit the legendary Viper Room on the Sunset Strip last night to show his support for an up-and-coming British singer ... a singer who happens to be Paul McCartney's only son.

Turns out, 34-year-old James McCartney is already building one hell of a fan base ... 'cause Eagles rocker Joe Walsh also checked out the performance.

Right before the show, we asked James about his favorite Beatles album ... and his answer was pretty surprising, considering it was a record that his dad has said he was unhappy with at the time of its release.