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Guess she's all grown up.

Tiger Woods' new gal pal Alyse Lahti Johnson may be just 22 years old, but the golfing great, 35, has known her quite a while.

In fact, a friend of the grad student tells the new issue of Us Weekly (on stands now), that Johnson, whose stepfather lives next door to Woods in Windermere, Florida and serves as an executive at his sports management company, used to "draw good luck pictures for Tiger before his tournaments" when she was a child.

"They had photos in their house of their family with Tiger," says the pal. "But Alyse never said she was interested in him!"

A second insider adds that the pair actually reconnected because of Johnson's stepdad.

"They started dating around New Year's Eve after seeing each other at one her dad's functions." 

For more details on Tiger Woods' new squeeze, check out this weeks Us Weekly, on stands now.