‘Twilight’ Star Michael Welch — DIVORCE … On Valentine’s Day

Exclusive 0221-michael-welch-marissa-lefton-gettyTwilight” star Michael Welch spent his Valentine”s Day doing something special with his estranged wife — THEY FINALLY FILED FOR DIVORCE …. how romantic! 

our sources has learned … Welch — who played spiky haired Mike Newton in the first three “Twilight” flicks — filed a joint petition for divorce with his soon-to-be ex-wife Marissa Lefton.

The two were married back in 2008 … and according to the docs, filed at L.A. County Superior Court, they separated in December 2011.

Should be an easy parting of ways … “cause according to the legal papers, they have no community property to split up … and no kids either.

Fun Fact — Marissa played 3-year-old Annie in “Father of the Bride” back in 1991 … pretty cool, right!