NFL's Eric Decker -- Terrible (Hot) Fake Guitarist ... In Wife's Music Video

NY Jets wide receiver Eric Decker may have found his second calling ... MUSIC VIDEO VIXEN ... 'cause the guy plays "sexy model" in his wife's new video ... complete with bad fake guitar playing.

FYI -- Decker's married to country music superstar Jessie James ... who just released a video for her new song, "Clint Eastwood."

The video has all the traditional staples of a country song -- a trailer, daisy dukes ... and dudes playing guitars.

One of those guys is Decker ... who chews on a stogie and pretends to play along in Jessie's backup band while she belts out the main tune. It's pretty funny to watch.