BRITNEY SPEARS was reunited briefly with her sons on Saturday night, spending about three hours with the two little boys nearly two months after the troubled pop star last saw them.Spears' father, JAMES, played a key part in making possible the visit with JAYDEN JAMES, one, and SEAN PRESTON, two, said a spokesman for Spears' ex-husband KEVIN FEDERLINE. The spokesman would not say where the reunion took place or who else was there, but People magazine reported that Spears' psychiatrist was present. Spears had not been allowed to see the boys since January 3, when she refused to return the children after a visitation.