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The grandbaby bombshell is swelling around the globe -- and shaking the political world.

The would-be VP announced yesterday that her 17-year-old, unwed daughter Bristol -- pictured with her baby brother -- is expecting her first baby -- and "Extra" has learned that the baby daddy is an 18-year-old high school hockey jock named Levi Johnston. While Levi claimed on his now-deleted MySpace page that he was "in a relationship," he also stated, "I don't want kids."

Us Weekly's Jill Martin tells "Extra" that Bristol and Levi are two ordinary teenagers. "Bristol's a school spirit leader -- very social -- and Levi's into camping, fishing, and hanging out with the boys." McCain's 23-year-old daughter Meghan also blogged her support for the teen, writing, "I support Bristol and the entire Palin family."

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