How Kimberly Caldwell Landed David Cook

David Cook may have asked Kimberly Caldwell out on a date on national TV, but it was really Kimberly who made the first move in their budding romance.

After hearing that the 25-year-old American Idol champ was interested in her, Kimberly waste no time in trying to get access to him, a source tells OK!.

“Kimberly made her way to the Idol set during a taping and asked one of the security guys to slip David her number," her pal tells OK!. "She insisted they tell him to call.”

Her wish was granted and, adds the source, the two went undetected for a month before anyone caught wind of their romance in May.

The new relationship -- which will be tested as David hits the road starting tomorrow for the American Idol tour -- came at just the right time for the 26-year-old season two finalist.

“Kimberly was going through a bad breakup at the time,” the source says. “She was thrilled when she heard David was into her.”