Big daddy Larry Birkhead opens up to FOX News' Greta Van Susteren tonight -- about how he's gone from behind a camera -- to being a paparazzi magnet himself.

Just a year ago, Birkhead was an unknown celebrity photographer, now he's as famous a blonde dad as Brad Pitt, after prevailing in the tumultuous custody battle for his and Anna Nicole Smith's daughter, the ecstatic Dannielynn.

Larry discusses diaper duty and how much his life has changed since gaining custody of his daughter.