Big day for Michael Lohan ... his daughter escaped jail ... and his fiancee just gave birth to a BOUNCING BABY BOY!!!
While Lindsay was sweatin' it out in court, Kate Major went into labor at a Florida hospital.
We're told Kate gave birth to a son -- Landon Major Lohan -- at 11:39 AM PT.
The baby weighed in at 19 3/4 inches, 7 lbs 5 oz ... and is already wanted in 3 states (kidding!).
We're told Michael was with Kate the entire time ... and even cut the umbilical cord.
A rep for the family tells us baby, Michael and Kate are all doing great.
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