NBC’s Tim Russert broke some news on his MSNBC show this weekend: MSNBC’s chief Washington correspondent Norah O’Donnell is pregnant. O’Donnell gave birth to twins just last May, prompting Russert to say, “She has Henry and she has Grace. 13 months…this is an Irish triplet.”

Henry and Grace were born May 20. Since her return from family leave in September, O’Donnell who works from NBC’s Washington Bureau, has anchored for MSNBC daytime as well as late night hours on some primary nights. She has also been the primary exit poll data correspondent.

And she may make it back just in time for election night. O’Donnell is due in July. Congrats to Norah and husband Geoff Tracy!

>Update: O’Donnell tells us she’ll be back in time for the Democratic and Republican Conventions in late August. “Wouldn’t miss it!” she writes.

>More: Over on Russert’s NBC show, Ralph Nader made news with his announcement that he would run for President as the Green party candidate…