Lindsay Lohan upset at dad (again) over girlfriend's pregnancy

Lindsay Lohan is about to become a big sister - and she's not too happy about it.

According to TMZ.com, Lindsay was shocked by the news that dad Michael Lohan, and his on-again, off-again girlfriend, Kate Major, are expecting, and she's upset that she didn't hear the news straight from him.

Apparently, Linds, 26, is also seriously concerned about what her mother, Dina Lohan, will think since Dina's taken Michael to court several times for failing to pay child support.

In the past, Major has accused her boyfriend of domestic violence.