Dr. Conrad Murray's baby mama Nicole Alvarez is furious over the maximum sentence that was imposed today -- claiming Judge Pastor's decision was "ridiculous."

Nicole stepped out today with her son -- insisting Murray has beaten himself up non-stop since Michael's death ... despite Judge Pastor's claim the doctor showed no remorse for his crime.

Nicole adds, Murray has been "mournful for the past two-and-a-half years."

There's no bigger stage for an aspiring actress than the Conrad Murray manslaughhter trial -- and today, the doc's 29-year-old baby mama is NAILING her biggest audition ever!!!

Nicole Alvarez -- a former Vegas stripper Murray met in 2005 -- is flashing her BIG, GIANT, er, smile on the stand right now ... and during her testimony, she's proved she's got some serious emotional RANGE!!!

Just check out the pics below -- think she'll get a gig out of this???

Dr. Conrad Murray's baby mama -- not the one he had child support issues with in Las Vegas, one of the other ones -- went shopping on ritzy Robertson Blvd. yesterday. We don't know who's paying the tab.



Law enforcement has told TMZ Murray had shipments of Propofol delivered to Nicole Alvarez's apartment in Santa Monica. Murray was living with Alvarez while he was "treating" Michael Jackson.

Alvarez birthed Murray's seventh child, Che Giovanni Murray, on March 2 at Cedars-Sinai Medical Center.

TMZ has confirmed one of Dr. Conrad Murray's baby mamas will be called to testify before the L.A. County Grand Jury in the Michael Jackson investigation -- because she's not cooperating with the cops.

The L.A. County D.A. has asked the Grand Jury to put Nicole Alvarez under oath and testify about Dr. Murray's comings and goings around the time Jackson died.

Alvarez -- the mother of Dr. Murray's 7th child -- lives in Santa Monica, CA. As we first reported, law enforcement sources told us they believe Dr. Murray was actually living in Santa Monica during the time he was supposedly living at Jackson's house. Although we've heard he may have been living with Alvarez, we have not been able to confirm that.

This development does not mean the Grand Jury will decide whether to charge Dr. Murray with the death of Jackson -- this is merely an investigative tool law enforcement sometimes uses with uncooperative witnesses.