Weber's estranged wife, Juliette Hohnen, filed the docs in Los Angeles County Superior Court in early February -- citing "irreconcilable differences."
This is divorce #2 for Weber ... who's recently appeared on "2 Broke Girls" and "Wilfred."
According to docs, Steven and Juliette tied the knot back in 1995 -- while he was playing Brian Hackett on "Wings" -- and they've been separated since Oct 2012.
They have two sons together -- ages 10 and 12. She's asking for joint legal and physical custody ... and spousal support.
Fun fact: Steven's first ex-wife is Finn Carter -- co-star of the 90s cult classic "Tremors" ... which is awesome.