Fergie's taking the phrase "sweet child o' mine" to a new level ... naming her brand new son after Guns 'N Roses singer Axl Rose.
Fergie's rep tells TMZ, Axl Jack Duhamel was born healthy this morning at 7 pounds 10 ounces.
Fergie underwent a c-section procedure at an L.A. hospital -- and as we reported, the 38-year-old singer will be recuperating in style, staying in one of the V.I.P. suites famously used by celebrities like Kim Kardashian and Dwight Howard.
The name doesn't feel like a coincidence ... you'll recall Fergie performed the Guns 'N Roses hit "Sweet Child O' Mine" at the 2011 Super Bowl halftime show.