Wayne's mentor -- Birdman -- confirmed the news on Twitter ... saying, "Lil Wayne's Cash Money family has a new member! Paris Hilton: RichgangRichgirl."



According to Showbiz411, Hilton's album will focus on house music -- no surprise, since she's been DJing at various clubs all over the world ... and training with some house music bigshots for years.



The album -- Hilton's first since 2006 -- will reportedly be produced by Afrojack ... and will feature bona fide stars like Lil Wayne.