He appeared on the cover of his first catalogue at the age of five and appeared in his first regional commercial at seven. Recognizing that Monaghan was an exceptionally outgoing child, his mother sent his picture to modeling agencies when he was three.
He and his mother relocated to Boca Raton, Florida, shortly after his birth.
Monaghan was born in Santa Monica, California, the only child of Diane Monaghan, an insurance claims specialist and single mother.
