Who's surprised?  Heidi Montag has confirmed with Extra that when the time comes, they will do it live on TV:

I'm just waiting for that big ring!"  As for kids:  "I want kids...eventually,"

Maybe she is smarter than people thought.  When asked if she wanted to leave The Hills:

"No, where would I go?"

The full interview runs on Extra tonight.  The new season of the MTV staged reality show The Hills airs tonight.

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