Nelson Bro to Wife -- Get Outta My Hair!

Matthew Nelson, the long, blonde haired guy from the 90s band Nelson, is pulling the plug on his marriage ... and get this -- the former rocker is the one asking for spousal support.

Nelson filed for divorce in L.A. County Superior Court on Monday, citing irreconcilable differences with his wife Yvette Stefens -- a former model who also played in the 2005 Lingerie Bowl.

Matthew and Yvette were married in 1995 ... about 4 years after the band had already ceased to be relevant.