Hilaria Baldwin will reportedly give birth today.

The 29-year-old yoga instructor checked into New York's Mount Sinai hospital where she is expected to have her first child with 55-old husband Alec Baldwin at any time. "The baby hasn't arrived yet, but it could be any moment," a source told Page Six.

Hilaria previously revealed plans for a natural childbirth, although she isn't adverse to having an epidural if the pain gets too bad: "Right now, I want to do it naturally. That's not to say there's something wrong with the epidural, but that's the way I was raised - I'm a pretty natural person. But if it does get to the point where I am screaming for the epidural, I have no problems with that. We'll see where it goes."

The couple have also been reading the pregnancy self-help book What To Expect When You're Expecting, so they know that everything is progressing normally. "We read parts of What to Expect When You're Expecting together every day. He'll point things out and ask 'How are you feeling? Are you having that?'" Hilaria explained.