Here's part of the New York Times account of the story.
Likewise, some in the Milonas camp suggest that Mr. Orszag had promised to marry her, but then met Ms. Golodryga; the Orszag people say that Ms. Milonas wanted to get married, but Peter did not, at least to Claire.
“We were in a committed relationship until the spring of 2009,” Mr. Orszag and Ms. Milonas said in a joint statement Wednesday (spurred by the Post article). “In November, Claire gave birth to a beautiful baby girl. Although we are no longer together, we are both thrilled she is happy and healthy, and we would hope that everyone would respect their privacy.”
What I found so postmodern and self centered about Orszag and his former girlfriend is that while they're no longer together they're both thrilled that she's happy. No mention of the child's prospects for happiness.