Rasmusen's news comes less than a week after Aiken and record producer Jaymes Foster welcomed their first child -- Parker Foster Aiken -- via artificial insemination.
"Isn't this crazy? We're going to both be parents! It's so exciting," Rasmusen told People. "We went from being nobodies to being on American Idol together, and now starting our families [at the same time]."
The now 23-year-old Salt Lake City, UT resident finished sixth during Idol's Spring 2003 second season, in which Aiken eventually finished as the runner-up to Ruben Studdard.
She met Herbert -- the son of Utah Lt. Governor Gary Herbert -- at Brigham Young University and the couple wed in December 2005.
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