Blair gave birth to a son, who is named Arthur.
"This is why I can't lose my baby weight, because I ate crepes, I ate French toast, I ate an ice cream cone, I had french fries, and three hamburgers," Cosmopolitan magazine quoted her as saying.
"Then I'm going to go and have a full dinner with my son. Then I'll go out again tonight," she added.
Arthur is Blair's son from her previous relationship with fashion designer Jason Bleick.
The 41-year-old said that she has never been one of those people who can eat without putting on weight, reports femalefirst.co.uk
"It's terrible and I don't like what it does to my body, believe me, because I'm not one of these people that's like, I can eat whatever I want, whenever," she said.
The actress has been seen in films like "Cruel Intentions", "Legally Blonde" and "The Fog".
--IANS (Posted on 11-09-2013)