Beyonce's Dad You ARE the Father

3/24/2010 1:18 AM PDT

Beyonce's Dad -- You ARE the Father

Beyonce Knowles is officially a big sister again. A DNA test has confirmed that Mathew Knowles is the father of Alexsandra Wright's brand new baby boy ... sources tell TMZ.

With the DNA test a match, we're told lawyers for Knowles and Wright are in the final stages of negotiating a settlement for baby Nixon's child support.

Wright filed a paternity suit last October against Knowles -- who was temporarily ordered to pay $8,200 in monthly child support.

Wright claims she had an 18-month affair with Knowles.

As far as we know, nothing's tricky about Nixon .... so far.