Tupac's Mom Sues for $1.1 Million -- Rap Money Is Mine

You haven't met a protective mother until you've met Tupac's mom ... she's now suing over unpaid royalties stemming from the late rapper's posthumous album ... to the tune of $1.1 million.

Afeni Shakur -- the co-administrator of Tupac's estate -- filed the lawsuit against a company called Entertainment One, claiming it breached a contract to pay Tupac's estate royalties on "Beginnings: The Lost Tapes," which was released in June 2007.

According to the suit, E1 purchased the rights to Tupac's music (previously owned by Death Row Records) in July. FYI, Death Row went bankrupt in 2006.

Afeni claims E1 now owes Tupac's estate $1.1 million ... and it better pony up fast. She also wants E1 to hand over the master recordings of all Tupac's unreleased music.

Hell hath no fury like a mother scorned. Calls to E1 weren't returned.