The woman whose boyfriend allegedly left her for Lady GaGa is determined to "take the moral high ground" by refusing to speak out, because she wants to keep the scandal low-key for the "sake" of her son.
Lady Gaga recently revived her relationship with ex-boyfriend Matthew Williams, who allegedly dumped Erin Hirsch, the mother of his young son, to be with the singer.
The Poker Face hitmaker was recently pictured cradling the 10-month-old youngster, named Cairo, on a recent outing with her lover.
The pictures are said to have devastated Hirsch, who became involved with Williams after he split from Gaga in 2008.
A source tells British newspaper the News of the World, "Erin is very upset about what has happened. Losing the father of her child to this woman and seeing pictures of him kissing her was bad enough. But then seeing Gaga holding their baby in public has been totally devastating for Erin. There were words between her and Mathew, but he's absolutely not apologised."
But Hirsch is determined to keep the matter as private as possible, telling the publication, "I am afraid that I have to take the moral high ground for the sake of my son. I don't want to talk about his publicly due to him."